Darmstadt completed the signing of United States youngster McKinze Gaines from Wolfsburg on Thursday.
Arsenal have confirmed that forward Takuma Asano will spend a second season on loan at German club Stuttgart.
Holger Badstuber is seeking a new challenge outside of Bundesliga when he leaves Bayern Munich this summer.
RB Leipzig have reiterated they won't allow Premier League targets Naby Keita and Emil Forsberg a transfer away from the Zentralstadion this summer.
Bayern Munich's Thomas Muller failed to make any of his putts during a guest appearance at the BMW International Open in Munich.
Dortmund have said Mario Gotze is close to returning to training following the "metabolic disturbances" that have kept him sidelined since February.