Celtic do not want to sell, but there are plenty of clubs willing to buy.
That is the problem facing Ronny Deila as he endeavours to keep Virgil van Dijk at Parkhead.
The Hoops spotted the Dutchman’s potential early, with a £2.6 million deal bringing him to Glasgow from Groningen in the summer of 2013.
They have offered a grander stage on which to display his talent, and scouts have flocked to catch a glimpse of the talented 23-year-old in action.
Were Celtic to cash-in during the January window, they would expect to generate at least three times what they spent on Van Dijk.
It could be that a fee of over £10 million would be required to secure his services, which would represent good business for the Scottish champions.
Celtic will, however, be doing all they can to fend off the mounting interest, with Craig Gordon of the opinion that Van Dijk is among the finest centre-halves in European football.
The Scotland international goalkeeper told Sky Sports: “He’s a brilliant player. I’ve said in countless interviews how good he is as a centre-half and the attributes he brings to the team.
“He’s powerful, he wins his headers, he’s good on the ball, he makes passes, he starts off our attacks and he defends well as well. He really does have everything that you could possibly ask for in a centre-half. He’s one of the quickest centre-halves I have played with as well, so he does have absolutely everything for the modern centre-half and what anybody would want.
“It’s fantastic that we’ve got him and if we do go past the transfer window and he’s still here, I certainly won’t be complaining.”
Celtic will do well to make it to February with Van Dijk still on their books.
The likes of Arsenal and Manchester United have been credited with holding an interest and would have no problem finding the required funds.
The longer the January window goes on without Arsene Wenger and Louis van Gaal adding to their defensive ranks, the more likely a raid on Parkhead will become.