Marshall, who has been on the outer and out of form at Wests since signing a deal with Super Rugby side the Auckland Blues earlier this month, missed tackles and failed to find targets with both his hands and feet in the Tigers' miserable 56-14 loss to the Sydney Roosters on Monday night.
Legendary halfbacks Andrew Johns and Peter Sterling both suggested they would axe Marshall and promote youngster Luke Brooks for the match against the Dragons.
"His heart is just not in it anymore," Johns told Triple M.
"Something has got to happen this week."
Potter, who controversially benched Marshall earlier this season, opted against dropping the New Zealand star but was forced to omit centre Blake Ayshford from the side that was thumped by the Roosters.
Ayshford, who will join Cronulla after this season, suffered a fractured eye-socket in the loss to the Roosters and has played his last game for the Tigers.
The Sharks, who host the table-topping Roosters on Monday night, regained Wade Graham after a week on the sidelines with Jayson Bukuya dropped back to the interchange bench.
Meanwhile, Canterbury named an unchanged side for their blockbuster clash with South Sydney at ANZ Stadium on Friday night.
Josh Morris, who starred as the Bulldogs' stand-in No.1 in a 28-16 win over Canberra, will square off against Souths superstar Greg Inglis.
However Justin Hunt, who in the past has filled in for Inglis at fullback, was named on an extended seven-man bench by Souths coach Michael Maguire.
Ben Lowe will start at lock in place of Jeff Lima, who was given a one-match ban for twisting the leg of Manly's Anthony Watmough.
Watmough was named in the Sea Eagles side that are away to Canberra on Sunday, but doubts remain whether coach Geoff Toovey will take a risk on his knee injury.
Gold Coast halfback Albert Kelly will return from a sternum injury in his side's home match against the Warriors on Saturday, with co-captain Greg Bird named despite leaving the field against North Queensland last week with a back injury.
Injury-plagued Warrior Jerome Ropati will play his first NRL match in more than three months, having been selected on the right wing by coach Matthew Elliott.
Injury-plagued Jerome Ropati is ready to play his first NRL match in more than three months after being named in the Warriors' team for Saturday's NRL clash against the Gold Coast Titans in Robina.
Ropati's May 5 appearance was the 28-year-old international's second NRL match back from knee surgery, only to be sidelined by a hamstring complaint.
"Jerome has been working his way back to a return to the NRL," Warriors coach Matthew Elliott said in a statement.
"He has been a part of all our training lately and it was only a matter of time before he came back into the side."
In other changes to the Warriors' line-up, Suaia Matagi has been named in the run-on side, Elijah Taylor moves from loose forward to start in the second row, Todd Lowrie will wear the No.13 jersey and Feleti Mateo is on the interchange alongside Ben Matulino, Jacob Lillyman, Dominique Peyroux and Laumape.
Dane Nielsen is named in the centres despite before being forced off with an ankle sprain just 12 minutes into Sunday's 24-28 loss to Penrith.
PENRITH PANTHERS v BRISBANE BRONCOS at Centrebet Stadium, 7.35pm
PANTHERS: Lachlan Coote, Josh Mansour, Lewis Brown, Dean Whare, David Simmons, Isaac John, Luke Walsh, Sam McKendry, Kevin Kingston (capt), Tim Grant, Clint Newton, Sika Manu, Ryan Simpkins. Interchange: James Segeyaro, Nathan Smith, Jeremy Latimore, Mose Masoe, Matt Moylan (one to be omitted).
BRONCOS: Josh Hoffman, Corey Oates, Jack Reed, David Stagg, Jordan Kahu, Scott Prince, Ben Hunt, Ben Hannant, Andrew McCullough, Josh McGuire, Sam Thaiday (capt), Matt Gillett, Corey Parker. Interchange: Peter Wallace, Dunamis Lui, Lama Tasi, Jarrod Wallace, Scott Anderson, Nick Slyney (two to be omitted).
Referees: Gavin Badger, Luke Phillips.
SOUTH SYDNEY RABBITOHS v CANTERBURY BULLDOGS at ANZ Stadium, 7.35pm
RABBITOHS: Greg Inglis, Nathan Merritt, Bryson Goodwin, Dylan Walker, Dylan Farrell, John Sutton, Adam Reynolds, Luke Burgess, Issac Luke, Roy Asotasi, Chris McQueen, Ben Te'o, Ben Lowe. Interchange: Luke Keary, Jason Clark, George Burgess, Tom Burgess, Dave Tyrrell, Justin Hunt, Matt King (three to be omitted).
BULLDOGS: Josh Morris, Mitch Brown, Krisnan Inu, Tim Lafai, Sam Perrett, Josh Reynolds, Trent Hodkinson, Aiden Tolman, Michael Ennis (capt), James Graham, Frank Pritchard, Tony Williams, Dale Finucane. Interchange: Dene Halatau, Josh Jackson, Tim Browne, Martin Taupau, Lachlan Burr (one to be omitted).
Referees: Matt Cecchin, Gavin Reynolds.
ST GEORGE ILLAWARRA DRAGONS v WESTS TIGERS at SCG, 3.00pm
DRAGONS: Jason Nightingale, Brett Morris, Chase Stanley, Charly Runciman, Daniel Vidot, Adam Quinlan, Nathan Fien, Jack Stockwell, Mitch Rein, Ben Creagh (capt), Tyson Frizell, Leeson Ah Mau, Jack de Belin. Interchange: Matt Prior, Michael Weyman, Will Matthews, Bronson Harrison, Craig Garvey (one to be omitted).
TIGERS: James Tedesco, David Nofoaluma, Bodene Thompson, Tim Simona, Lote Tuqiri, Benji Marshall, Braith Anasta, Keith Galloway, Joel Luani, Adam Blair, Liam Fulton, Ben Murdoch-Masila, Suaso Sue. Interchange: Ava Seumanufagai, Jack Buchanan, Matt Bell, Curtis Sironen, Masada Iosefa, Shaun Spence (two to be omitted).
Referees: Jason Robinson, Phil Haines.
GOLD COAST TITANS v NZ WARRIORS at Skilled Park, 5.30pm
TITANS: William Zillman, Kevin Gordon, Brad Takairangi, Jamie Dowling, David Mead, Aidan Sezer, Albert Kelly, Luke Douglas, Beau Falloon, Nate Myles, Greg Bird, Mark Minichiello, Ashley Harrison. Interchange: David Taylor, Ryan James, Ben Ridge, Matt Srama.
WARRIORS: Kevin Locke, Jerome Ropati, Dane Nielsen, Konrad Hurrell, Manu Vatuvei, Thomas Leuluai, Shaun Johnson, Sam Rapira, Nathan Friend, Suaia Matagi, Elijah Taylor, Simon Mannering (capt), Todd Lowrie. Interchange: Ben Matulino, Jacob Lillyman, Feleti Mateo, Dominique Peyroux, Ngani Laumape (one to be omitted).
Referees: Gerard Sutton, Jared Maxwell.
NORTH QUEENSLAND COWBOYS v NEWCASTLE KNIGHTS at 1300SMILES Stadium, 7.30pm
COWBOYS: Matthew Bowen, Kyle Feldt, Brent Tate, Kane Linnett, Antonio Winterstein, Johnathan Thurston (capt), Robert Lui, Matthew Scott (capt), Ray Thompson, James Tamou, Gavin Cooper, Glenn Hall, Joel Riethmuller. Interchange: Rory Kostjasyn, Tariq Sims, Scott Bolton, Ricky Thorby, Ethan Lowe (one to be omitted).
KNIGHTS: Darius Boyd, James McManus, Dane Gagai, Joey Leilua, Akuila Uate, Jarrod Mullen (capt), Tyrone Roberts, Kade Snowden, Danny Buderus, Zane Tetevano, Robbie Rochow, Beau Scott, Alex McKinnon. Interchange: Kurt Gidley, Chris Houston, Neville Costigan, David Fa'alogo.
Referees: Shayne Hayne, Alan Shortall.
CANBERRA RAIDERS v MANLY SEA EAGLES at Canberra Stadium, 2.00pm
RAIDERS: Reece Robinson, Sandor Earl, Jarrod Croker, Bill Tupou, Sami Sauiluma, Anthony Milford, Josh McCrone (capt), David Shillington (capt), Shaun Berrigan, Brett White (capt), Josh Papalii, Joel Thompson, Paul Vaughan. Interchange: Glen Buttriss, Joel Edwards, Dane Tilse, Tom Learoyd-Lahrs, Sam Williams (one to be omitted).
SEA EAGLES: Brett Stewart, Jorge Taufua, Jamie Lyon (capt), Steve Matai, David Williams, Kieran Foran, Daly Cherry-Evans, Brenton Lawrence, Matt Ballin, Brent Kite, Anthony Watmough, Justin Horo, Glenn Stewart. Interchange: Richie Fa'aoso, Jamie Buhrer, David Gower, George Rose, James Hasson (one to be omitted).
Referees: Ben Cummins, Chris James.
MELBOURNE STORM v PARRAMATTA EELS at AAMI Park, 3.00pm
STORM: Billy Slater, Sisa Waqa, Will Chambers, Maurice Blair, Justin O'Neill, Brett Finch, Cooper Cronk, Jesse Bromwich, Cameron Smith (capt), Bryan Norrie, Kevin Proctor, Ryan Hoffman, Ryan Hinchcliffe. Interchange: Jason Ryles, Tohu Harris, Jordan McLean, Kenneath Bromwich.
EELS: Jake Mullaney, Ken Sio, Ryan Morgan, Vai Toutai, Semi Radradra, Ben Roberts, Luke Kelly, Tim Mannah (capt), Matt Keating, Fuifui Moimoi, Reni Maitua, Mitch Allgood, Darcy Lussick. Interchange: Junior Paulo, Joseph Paulo, Peni Terepo, Pat O'Hanlon, Daniel Harrison (one to be omitted).
Referees: Adam Devcich, Gavin Morris.
CRONULLA SHARKS v SYDNEY ROOSTERS at Remondis Stadium, 7.00pm
SHARKS: Michael Gordon, Sosaia Feki, Ben Pomeroy, Jonathan Wright, Beau Ryan, Todd Carney, Jeff Robson, Andrew Fifita, John Morris, Bryce Gibbs, Luke Lewis, Wade Graham, Paul Gallen (capt). Interchange: Isaac De Gois, Chris Heighington, Jayson Bukuya, Anthony Tupou, Sam Tagataese (one to be omitted).
ROOSTERS: Roger Tuivasa-Sheck, Daniel Tupou, Michael Jennings, Mitchell Aubusson, Shaun Kenny-Dowall, James Maloney, Mitchell Pearce, Jared Waerea-Hargreaves, Jake Friend, Sam Moa, Aidan Guerra, Sonny Bill Williams, Frank-Paul Nuuausala. Interchange: Daniel Mortimer, Luke O'Donnell, Isaac Liu, Dylan Napa.
Referees: Ashley Klein, Henry Perenara.