Mainz have signed Chile international Gonzalo Jara on a two-year contract after he left Nottingham Forest.
Schalke have completed the signing of Cameroon striker Eric Maxim Choupo-Moting on a three-year deal from Mainz.
Bolton have rejected a bid from Mainz for goalkeeper Adam Bogdan, Sky sources understand.
Bundesliga champions Bayern Munich will launch the defence of their title against Wolfsburg in the 2014/15 season.
Bayer Leverkusen have completed the signing of goalkeeper Dario Kresic at the end of his contract at Mainz.
Mainz and Thomas Tuchel have reached an agreement to cover the last year of the former boss' contract after he resigned.
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