Celtic have been repeatedly linked with a move for Hibernian midfielder McGinn.
Michael Stewart has told BBC Sportscene that he believes Celtic can sign Hibernian midfielder John McGinn for £2.5million plus Liam Henderson, if they were to bid for Neil Lennon's prized asset.
Celtic have been repeatedly linked with a move for the 23-year-old as he continues to impress with Hibs in the Scottish Premiership, after proving instrumental in helping Lennon's side return to the top tier of Scottish football.
McGinn impressed against Celtic on Sunday afternoon as Brendan Rodgers' side maintained their unbeaten run north of the border with a 2-2 draw away at Easter Road, which saw Scott Sinclair score a brace.
Former Hibs and Hearts midfielder Stewart replied to a fan's comment on Sportscene's Facebook Live Channel, stating that Celtic should look to sign McGinn for £1.5million and Henderson. Stewart believes if the Hoops upped that figure to £2.5million, they could land their man.
"I think that sort of thing, or that type of deal has a good probability of happening - it would be appealing to Hibs," Stewart said. "However, I think the transfer fee would have to be higher.
"£2.5million plus Henderson? Then you start thinking."
McGinn, a five-time Scotland international who was one of the players to be called up to Malky Mackay's experimental squad against Holland earlier this season, has been in excellent form in all areas of Hibs' play this season.
Scoring four goals and adding four assists, Hibs' number seven has proved effective in both boxes and could be seen as the long-term successor of captain Scott Brown at Parkhead.
Henderson, 21, has been afforded just 23 minutes of first-team football this season with his future at Celtic in doubt, as his contract expires on Parkhead in less than six months.