Robert Lewandowski is seeking a more lucrative deal at Borussia Dortmund, according to his agent Maik Barthel.
The striker has netted 14 times in 21 league games this season, becoming one of the top marksmen in the Bundesliga.
His current deal at the Signal-Iduna-Park expires in June 2014, but the player wants an improved offer before he heads to Euro 2012 in his native Poland.
Barthel told Sport-BILD: "It is a fact we have been talking about signing a new deal."
Lewandowski added: "At this moment in time I am just focused on Borussia Dortmund, afterwards I am playing in Euro 2012.
"You are unable to predict how life will be after that. I do not know - anything could happen.
"If a lucrative offer was to drop in, I would have to consider it."