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The United States international missed Dortmund's goalless draw against Wolfsburg on Sunday with muscular problems but has resumed training.
Busser, 45, becomes the fourth backroom staff member to move from Leverkusen to Munich in recent years.
Raf Honigstein details the problems VAR has faced in Germany after a Kicker survey of Bundesliga players revealed support for eliminating the new technology.
With no offer yet from Arsenal for Dortmund's Pierre-Emerick Aubameyang, ESPN FC's Raf Honigstein explains why a January move is a waiting game.
On Tuesday, the DFB told ESPN FC it had begun proceedings. Under its rules, the club could face a fine or even a stadium closure.
Christian Pulisic has revealed that he likes to go all-out attack when he plays as Borussia Dortmund on FIFA.