The £24million hitman looks set to create a summer scramble for his signature following his confession of discontent, but the club will be looking to recoup a large portion of the substantial transfer fee shelled out two years go.
However, should a club come in with a serious offer for Bent, he could be tempted to move on.
"It is about playing and, at my age, I can't have another season like this one," he told the Daily Star.
"Time is running out.
"I'm not really one of these guys who wants to sit there, not do anything and get paid."
Bent has seen his opportunities hindered by the arrival of Christian Benteke, who has had an incredible debut season in the Premier League.
The former Tottenham striker did envisage that the arrival of the young Belgian would signal the blossoming of a prolific partnership, but it has not turned out that way.
"He was a big guy and it looked as if the partnership would form," he added.
"But it's not meant to be. I don't quite know why."