Ballack is out of contract at the end of the season and can leave Chelsea on a free transfer.
“We are indeed interested in signing Michael Ballack. I’m confident that he’s ready to accept a pay cut if he decides to return to the Bundesliga this summer,” Schalke coach Felix Magath was quoted as saying by Berliner Kurier.
Inter Milan are also reportedly keen on signing the 33-year-old midfielder.
