Schalke are eyeing a possible move for Jens Lehmann as they bid to fill the gap left by Manuel Neuer.
Lehmann, 41, came out of retirement to play out the end of last season with former club Arsenal as they went through a goalkeeping crisis, and Schalke, another of his old sides, are considering making an approach for him.
They signed Ralf Faehrmann from Eintracht Frankfurt after Neuer joined Bayern Munich, and general manager Horst Heldt says Lehmann is in their thinking as well.
He told dpa: "We always said that we want to hire a second goalkeeper if Manuel Neuer leaves.
"There are various scenarios and Jens Lehmann is a part of it."
The 22-year-old Faehrmann added: "I can learn a lot every day from Jens Lehmann."