Danish forward Nicolai Jorgensen from Akademisk Boldklub; Midfielder Michael Ballack on a free transfer from Chelsea; Midfielder Hanno Balitsch from Hannover; Croatian defender Domagoj Vida from Osijek; Midfielder Sidney Sam from Hamburger; Croatian midfielder Zvonko Pamic from Karlovac; Brazilian defender Lucas from Portuguesa.
Midfielder Toni Kroos (loan return) from Bayer Leverkusen.
Brazilian forward Igor de Camargo from Standard; Defender Jens Wissing from Preussen Munster; Brazilian defender Bamba Anderson from Fortuna Duesseldorf.
Polish midfielder Lukasz Pisczek on a free transfer from Hertha Berlin; Polish forward Robert Lewandowski from Lech Poznan for a fee of €4m; Australian goalkeeper Mitchell Langerak from Melbourne Victory; Japanese midfielder Shinji Kagawa from Cerezo Osaka for a fee of €0.4m.
Greek midfielder Georgios Tzavelas from Panionios; Midfielder Sebastian Rode from Kickers Offenbach; Greek forward Theofanis Gekas from Bayer Leverkusen for a fee of €1m.
Midfielder Maximilian Nicu on a free transfer from Hertha Berlin.
Defender Lennard Sowah from Portsmouth; Czech goalkeeper Jaroslav Drobny from Hertha Berlin.
Goalkeeper Ron-Robert Zieler on a free transfer from Manchester United; Austrian defender Emanuel Pogatetz on a free transfer from Middlesbrough; Goalkeeper Markus Miller from Karlsruhe.
Forward Peniel Mlapa from 1860 Munich; Goalkeeper Tom Starke from Duisburg.
Austrian forward Erwin Hoffer on loan from Napoli; Czech defender Jan Simunek from Wolfsburg; Danish midfielder Leon Jessen from Midtjylland for a fee of €0.6m.
Croatian midfielder Mato Jajalo on loan from Siena; Midfielder Martin Lanig from Stuttgart; Greek defender Konstantinos Giannoulis from Iraklis; Romanian forward Alexandru Ionita from Rapid Bucharest for a fee of €2.5m.
Nigerian midfielder Haruna Babangida from Kuban Krasnodar; Midfielder Lewis Holtby on loan from Schalke; Midfielder Marco Caligiuri from Greuther Furth; Turkish midfielder Tufan Tosunoglu from Kickers Offenbach.
Midfielder Jens Hegeler on loan from Bayer Leverkusen; Midfielder Mehmet Ekici on loan from Bayern Munich; Swedish defender Per Nilsson from Hoffenheim.
Greek defender Kyriakos Papadopoulos from Olympiacos; Japanese defender Atsuto Uchida from Kashima Antlers for a fee of €1.3m; Defender Tim Hoogland from Mainz; Slovakian forward Erik Jendrisek from Kaiserslautern; Defender Christoph Metzelder from Real Madrid.
Italian defender Cristian Molinaro (permanent signing) from Juventus for a fee of €3.9m; Midfielder Christian Gentner from Wolfsburg; Goalkeeper Marc Ziegler from Borussia Dortmund; Austrian forward Martin Harnik from Werder Bremen.
Forward Felix Kroos from Hansa Rostock; Austrian forward Marko Arnautovic from Twente.
Brazilian midfielder Cicero on loan from Tombense; Croatian forward Mario Mandzukic from Dinamo Zagreb for a fee of €9m; Danish defender Simon Kjaer from Palermo for a fee of €10m; Defender Arne Friedrich from Hertha Berlin; Swiss midfielder Nassim Ben Khalifa from Grasshoppers Zurich