PSV Eindhoven boss Ronald Koeman has called on NAC Breda winger Leonardo to make a decision on his future.
The Dutch champions have made it clear that they want to sign the Brazilian, but he has so far failed to commit his future to PSV.
The winger can leave NAC for an agreed fee of é¼750,000 (£450,000) and it is believed a number of clubs could enter the bidding in January.
The winger's delay is causing PSV coach Koeman unrest, as he said in an interview with Voetbal International: "It is take it or leave it time."
PSV defender Michael Lamey is being linked with Bayer Leverkusen.
Bayer have been alerted to the fact that Lamey has lost his place in the PSV side and they are rumoured to be readying a bid for January.