Clarke is set to make an unexpectedly early return to action for NSW in the Sheffield Shield season opener against Tasmania starting on Wednesday.
Clarke has not played since scoring 75 in the fifth one-day international win against England at Southampton on September 16 due to his troublesome back problem.
He must still pass a final fitness test on Tuesday morning before he is cleared to lead NSW in the match at Sydney's Blacktown International Sportspark.
Clarke was initially expected to be back in time for the Blues second Shield match against Victoria starting on November 6.
Test batsmen David Warner and Steve Smith will also play for NSW as players press their claims for selection in the first Ashes Test at the Gabba on November 21.
Meanwhile, Marsh's impressive cricket resurrection has reached another milestone, with the batsman to captain WA in their Sheffield Shield opener.
Marsh will lead the Warriors in a Shield match for the first time this Wednesday in the round-one match against Victoria at the MCG.
The powerful left-hand batsman had previously captained his state in a one-dayer.
Marsh will fill in for Adam Voges, who is in India with the national one-day team.
The 30-year-old is pushing for Ashes selection after impressive form this month in the national one-day series.
He scored 119 against Queensland and also scored two 50s.
Marsh was supposed to also play in India, but a hamstring strain took him out of the tour and also the first two games of the domestic one-day competition.
"It's a huge honour and I know it's going to be a challenge for me, but it's one I'm looking forward to, to help guide the young guys and get a good feeling in the group, with a belief that we can go over there and win the game," Marsh said.
"It's pleasing for me to have worked so hard and start to see the rewards on the field in my performances, but to captain this great state is such an honour.
"I want to be a leader on the field, but it's important that I try to help these guys off the field as well and help to lead them in the right direction for what we're trying to achieve."
Rising star Will Bosisto will also make his first-class debut.
Victoria's team will include a clutch of players aiming to impress national selectors.
Incumbent Test players Peter Siddle and Chris Rogers headline an experienced side, including Ashes aspirants Fawad Ahmed, Rob Quiney and new Bushrangers captain Matthew Wade.
With opposite number Shaun Marsh leading the Warriors for the first time, the match shapes as a test of leadership.
"Despite the disappointing end to our one-day campaign, we are glad to see all our batsmen and bowlers in form," Victorian chairman of selectors Andrew Lynch said.
The Shield schedule features six matches before Christmas, a punishing 24 days of cricket in a seven-week window, including three matches before Australia's first Ashes Test beginning on November 21 in Brisbane.
"We have a plan in place to share the load, especially with the fast bowlers," Lynch said.