The 47-year-old former superbantam weight has often assisted Green in his preparation.
But after viewing Wednesday night’s 11th round knockout at the hands of WBC champion Krzysztof Wlodarczyk, Fenech believes the Perth champion's time may be up.
“There’s so much money in the sport and Danny makes big money every time he fights,” Fenech told 2KY.
“Will the money keep him in the sport?
“He’s always said that his health and everything else is important well he’ll have to weigh it up.
“Although yesterday’s performance was a great one for Danny Green, he was still knocked out and now we have to wait and see.
“In this day and age, money is a big talker.”
Following the loss, Green hinted he may head into retirement for good after suffering his second successive loss this year.
Green battled his way to 11 rounds with precision winning the majority of rounds before being struck twice in the 11th.
Wlodarczyk found Green with a vicious right and followed it up with a thunderous left which sent him to the canvas and whilst Green managed to regain his footing the referee had no other decision but to call the fight over.
It was a cruel end for Green, who had started so strongly after his humiliating IBO Cruiserweight title loss at the hands of Antonio Tarver in July.
But age looks to have finally caught up with the former Olympian, who as always gave his all but now looks to be in his boxing twilight.
“I believe that he was winning the fight,” said Fenech.
“One of the rare occasions where I noticed Danny was getting tired and was asking for water.
“Danny is usually one of those guys who doesn’t get tired.
“I think he was tired sitting on the ropes and then he got hit with a couple of big punches.
“For me Danny Green is usually one of those guys who finishes all over the top of you, that’s his strength and it wasn’t last year.
“He looked a little out of condition.
“I don’t know if they trained properly but when I saw him in the ninth and 10th round asking for water that concerned me immediately.”
Green, 38, has already once retired in 2008 before returning to the squared circle in 2009.
Fenech said while the Pole was tactical in his treatment of Green, the Cruiserweight champion had done little to convince him that he is a fighter of the highest quality.
“Everyone’s saying how good (Green) fought but does it say much of our champions today when Antonio Tarver can beat Danny Green every round and this guys supposed to be the best cruiserweight in the world and he was losing against him,” he said.
“What would Tarver do to him, Wlodarczyk?”