Cracovia manager Murat Colak has conceded that there is significant interest in Oskar Wojcik.
Celtic's £3.5 million bid for the defender was reported to have been turned down at the end of the January window.
The Parkhead club monitored the centre-back throughout the month.
There is speculation that Celtic are still interested, especially with a major summer overhaul expected following Martin O'Neill's permanent appointment as manager.
However, Wojcik has attracted attention from other clubs, including newly-promoted Premier League side Coventry City.
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The 22-year-old has expressed his ambition to play in England's top tier.
Speaking to Polish outlet Weszlo.com, Colak said: "Wojcik is a fantastic player for us, and we support him very much.
"I won't deny that there's a lot of interest in him. He's a player with enormous potential.
"He's in his prime. We've had some very good offers for him since the winter.
"We want to be fair to him. If a great offer comes in, one that's good for both the club and Oskar, we'll definitely consider it."
Last month, Wojcik addressed his future.
He told Meczyki: "I don't know anything at this point. I haven't heard anything from the club or my agents. It's only in the media.
"Obviously, it's not the right time yet, but I'll definitely want to get there (the English Premier League) someday.
"We don't know what will happen before then. There's no specific plan."
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