The Uruguay international is said to want a move to Anfield this month.
But a source at Ajax told talkSPORT: "He has a contract here until 2013 and he doesn't want to move.
"He wants to be a champion for Ajax which is what we hope to achieve. In the summer? We'll deal with it then.
"Have we had any bids? Not yet. It will have to be an attractive bid too."