Peterborough boss Darren Ferguson has said Scotland new-boy George Boyd is not for sale.
Boyd was called up to the Scotland 'B' squad after Ferguson discovered his grandfather was born in Lanarkshire.
Celtic have been keen on Boyd in the past, but were scared off by the price tag put on his head by the Posh, and Ferguson has revealed he would not welcome any more approaches.
"I wouldn't put a price on his head," Ferguson told the Daily Record.
"And I wouldn't listen to an offer for him if I got one.
"The only way I'd feel trapped in a moral dilemma would be if a Premiership club came in for George during the summer."
Boyd was signed from non-league Stevenage Borough for a Conference record of £260,000 in 2007, and Ferguson believes the 23 year-old winger's career is only just beginning.
"He might be a Championship player now, but in many ways George's career is only just beginning.
"We're all glad to see him get his chance with Scotland at this stage because, to be truthful, it reflects well on Peterborough and what we're trying to do."
Rangers have also been linked with a bid, but Posh director of football Barry Fry does not believe the Old Firm giants have the funds to sign Boyd.
Fry told the Daily Express: "Celtic have been sending scouts to our games for some time and I know that Darren spoke to Walter Smith about George.
"I don't know how far that has gone, but I can tell you right now that we would only sell George if an offer of silly money came in. Right now, I don't think that kind of silly money exists in Scotland.
"We've been saying to Premier League clubs interested that George can go if we get an offer of £5million, but I don't think it will happen.
"There has been no official contact with Celtic or Rangers in terms of concrete offers being made, but they've had scouts at our games in recent weeks as well.
"In fact, I'd say there will be a scout from one of those two clubs at nine out of every 10 games we play."
'The White Pele' as he was known by Stevenage fans, has made six appearances for England's 'C' team, but now has chance to shine with the Tartan Army and Ferguson wants Boyd to benefit from the experience.
"I've told him to join the Scotland squad and enjoy the experience to the full.
"I just hope he sees plenty of the ball and gets the chance to express himself the way he does for us at club level.
"Whatever happens I know he won't be judged on the strength of one game."