The retired Premier League official believes his former colleague must seriously consider his ability to keep up with play after the tackle on Massadio Haidara went unpunished
Haidara was forced off in the first half of Newcastle's 2-1 defeat against Wigan with what the Tyneside club fear is serious knee ligament damage after being caught by McManaman's studs.
"I just hope Mark looks at it and thinks, 'is it time? Is this a signal to go? Let's bow out with some grace and dignity and go" - Graham Poll
"The modern footballer is fitter than ever and you have to question whether a 50-year-old can keep up with play sufficiently and have the mental sharpness to make decisions under that intense scrutiny," he told talkSPORT.
"I watch games and I see some referees who try their very hardest to run around as best as they possibly can and I get very disappointed when I see someone who doesn't do that. That's my opinion and I refereed a lot of Premier League games and I worked very hard.
"Mark used to be one of the fittest referees in the Premier League. He was incredible. I did fitness tests with him again and again. He used to run around like a mad thing. He was a very, very good referee.
"People asked me why I stopped when I was 42. I'd rather stop refereeing and people say you should have done another couple of years than go on too long. That's why I'm fearing for Mark.
"He's been through a tough time in his life [with cancer] and no one wishes that on anyone. I just hope Mark looks at it and thinks, 'is it time? Is this a signal to go? Let's bow out with some grace and dignity and go. It's time for me to call it a day.'"