Celtic assistant manager Mark Venus has admitted that every player has his price, even Aiden McGeady.
The Republic of Ireland winger has reportedly attracted interest from Premier League outfit Birmingham after a stunning first half to the season.
Bhoys boss Tony Mowbray last week told any potential suitors that they would be wasting their time even picking up the phone to enquire about McGeady's availability.
Venus has now backed up Mowbray by insisting that Celtic are determined to keep the talented 23-year-old.
However, Venus concedes that it would be wrong to make any guarantees about McGeady's future as it would be difficult to turn down a massive offer.
"Everyone undoubtedly knows that he's a very, very good player," he said. "I thoroughly enjoy working with him every day in training.
"His appetite for the game and his desire for training and football is fantastic and I don't personally believe he's the type of player that we want to lose.
"But every footballer has a price, I would suggest at any football club.
"So it would be folly of me to sit here and say to you that there's no way Aiden McGeady's leaving.
"But I would suggest it would probably take a lot of money."
While McGeady has been linked with a move away from Celtic, reports have suggested Arsenal defender Philippe Senderos could be on his way to Glasgow.
The out-of-favour centre-back has expressed a desire to leave the Emirates Stadium but Venus maintains he knows nothing about any possible interest from Celtic.
"It's a name that gets bandied around always," he explained.
"In this month especially, there are more and more names put in the papers every day.
"Even I look forward to coming in and reading them to see who we're going to sign!"
He added of Celtic's reported interest in Senderos: "I don't know whether there is or isn't."