Schalke management want a definitive decision from Joel Matip over his future.
The Cameroon defender is off contract in June and a Bosman target for Liverpool.
Reviersport says Schalke want a decision from Matip in the coming weeks as they draw up plans for next season.
It's suggested Matip is now leaning towards leaving the Bundesliga club.
Schalke have offered to double Matip's wages for him to stay.