The Croatia international is not getting the games for some reason, he has missed the last three and was not even included in the team squad for the trip to Chelsea last weekend.
Speaking to the Lancashire Telegraph, the player’s agent Tomislav Erceg said: "It has not been easy for Nikola and we don't know what has happened because last month he played for a strong Croatian team but he has not played a second for Blackburn."
He added: "We are not even talking about other clubs now though because he is contracted with Blackburn and wants to concentrate on helping the club out of a difficult position.
"He likes Blackburn Rovers and is happy here but he needs to play. He is a young player who is very confident about what he can do and we will have to see what happens in the summer.
"We hope he will play and stay but if he does not play he might have to change clubs. We will speak with the club in the summer but until then there is no problem and he will keep working hard to help the club.
"Obviously there are clubs who would want him but they are not even in our thoughts at the moment."