Hertha Berlin striker Marko Pantelic is considering offers from Bolton Wanderers and Fulham.
"It's a fundamental decision," the player's adviser Marc Schermann told Kicker. "By the end of February or mid-March, Marko wants to be clear about what he does in the summer.
"Marko has nothing more to prove to anyone.
"He knows what he owes to Hertha but the club should not exploit that."