Ajax chief Marc Overmars has confirmed Andre Onana could be sold in January.
The Cameroon goalkeeper is serving a doping ban and will be available to play before the end of the year.
Arsenal and Inter Milan are being linked with Onana.
Overmars said: "You can never say never in football, but at the moment I do not see that he extends his contract with us.
"We have been very clear. We have spent a lot of time negotiating to extend his contract, but it did not work. We then gave him the space to move during the summer and it did not work either.
"He can leave in January, otherwise he will leave for free next June."
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!