Munich - Schalke signed Germany Under-21 midfielder Johannes Geis from Bundesliga rival Mainz on a four-year contract on Tuesday.
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Details of the transfer were not disclosed. Geis had another two years on his contract with Mainz.
Mainz announced it replaced Geis with Switzerland midfielder Fabian Frei on a four-year deal.
Geis is at the European U21 Championship in the Czech Republic.
Schalke is rebuilding under new coach Andre Breitenreiter.