Mainz moved up to third in the Bundesliga on Saturday night with a 2-0 win over Borussia Dortmund.
Shinji Kagawa says former Man Utd manager David Moyes lost confidence in him after a frustrating time at Old Trafford.
Goals from Ciro Immobile and Pierre-Emerick Aubameyang helped Borussia Dortmund to a 2-0 win over a lacklustre Arsenal.
Borussia Dortmund boss Jurgen Klopp praised his 'brave' players following their 2-0 Champions League win over Arsenal.
Jurgen Klopp believes Arsenal made a number of strong summer signings and expects them to be tough opponents on Tuesday.
Shinji Kagawa said it was "difficult to describe" how he was feeling after his fairy-tale return to Borussia Dortmund.
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