The Sun claims Neil Warnock is keen on Marriott, who has scored 23 goals in all competitions this season, after the Bluebirds’ bids for other strikers faltered.
Marriott has been linked with Leeds United and Hull City during the current transfer window, although Tigers boss Nigel Adkins has denied making any bid for the player.
The Beverley-born striker was denied another goal by a disputed offside call in Peterborough’s 0-0 draw at Wigan Athletic on Saturday.
Posh boss McCann was philosophical about the League One club’s chances of holding on to Marriott when he spoke last week.
“It’s important we keep him. But this is Peterborough United, not Manchester United, and we have to cut our cloth accordingly,” he said.
“I don’t think the chairman or Barry Fry are trying to sell him, but there is no doubt Jack is way above League One. With his pace and goals, I am sure he could easily play in the Championship, or maybe higher.”
Rangers manager Steven Gerrard is weighing up a move for Liverpool full-back Jon Flanagan, reports claim.
Scottish champions Celtic are reportedly ready to offer full-back Calvin Miller a new deal before sending him out on loan.
Everton target Jack Wilshere has sparked a scramble for his signature after confirming he is leaving Arsenal this summer.
Tottenham's hopes of landing Wilfried Zaha have been hit by the news Crystal Palace have offered him a bumper new deal to stay.
Ryan Giggs says Gareth Bale would be the perfect fit for Manchester United but has doubts over whether he will leave Real Madrid.
Manchester City's attempts to sign Riyad Mahrez could be in doubt again as reports claim Leicester only want a straight cash deal.