"I just wanted some advice. I know Wayne is always there - I can call him no matter what it is."
However, ex-Dragons half Marshall quickly found himself negotiating a deal that would extend his career to a 15th NRL season.
"He (Bennett) said 'what do you want to do?"' Marshall said.
"I said I wanted my running game back.
"An hour later he called me and said 'this is what I want you do, if you agree, done deal'.
"We didn't talk about money. I just said OK - we did the deal pretty much on the phone."
After a run with hamstring injuries in 2016, Marshall is determined to show he still has a few tricks up his sleeve.
He made an impressive start, winning the 1.5km time trial at his first Brisbane pre-season session on Monday.
"He (Bennett) said I still had life left in my legs and that he could help me with it - I am very excited," the ex-Wests Tigers premiership halfback said.
"To be honest last year (2016 season) looked like being my farewell.
"This is my chance to enjoy the footy. This decision is pretty much about me."
But at what cost?
Marshall is believed to have signed a $100,000 Broncos deal - a fraction of a reported $300,000 12-month Dragons offer the veteran knocked back earlier this year.
"It's not so much humbling, it is something I wanted to do," Marshall said of his pay cut.
"I think that is one of the key things with Wayne - it wasn't about the money for me. For me it is about finishing the way I want to finish and enjoying footy the way I want to play."
If only Marshall knew exactly where he would be playing for Brisbane.
The former Kiwi captain has been linked to everywhere from the centres to a bench utility role for the Broncos.
"To be honest with you I don't know," Marshall said. "But wherever it is I want it to be in the top 17.
"I will try my hardest to make that happen."
- AAP