"They're probably right. It's got nothing to do with contracts.
"Everyone's got to perform. Any team you're in, every player's got to perform."
While the limp effort in going down to the Cowboys was not unexpected, things won't get any easier against Brisbane at Suncorp Stadium on Thursday night.
Marshall says his future is unlikely to be sorted for at least another three weeks.
The former Wests Tigers premiership-winner laughed off the Dragons' initial offer, believing he was worth more.
The only thing the 31-year-old does know is he still definitely wants to play next season - whether it's at the Dragons or another NRL club.
"Am I that old?" Marshall said when asked about retirement.
"31, mate. You do the math.
"I'll be playing next year. I'm not doubtful of that, just don't know where yet."