Liverpool have enquired about Eintracht Frankfurt defender Carlos Zambrano, the German club have revealed.
Raul has still to make a decision on his future at Schalke despite receiving a 'good' contract offer from the club.
Schalke defender Christian Fuchs is unaware of any interest in his services from defending European champions Barcelona.
Tore Reginiussen will not be returning to Schalke after a loan spell because he is signing for Odense.
Hoffenheim have signed former Germany Under 21 International Fabian Johnson from Wolfsburg.
St. Pauli have completed the signing of Peru defender Carlos Zambrano on a two-year loan deal from Schalke.