Vidic joined in the summer from Manchester United.
"I am very happy with Nemanja's performances recently," agent Silvano Martina told fcinternews.it.
"What does the future hold? I cannot say yet, because I do not represent the club. I am not an Inter director.
"The player is certainly happy, I can see he is enjoying his football and satisfied. Of course Nemanja has always been a winner and the fact this season did not bring positive results for the team means he cannot be happy in that sense.
"What are his chances of staying at Inter? We'll see how this season ends. I can only reply that last summer we signed a three-year contract."