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Peter Stoger insists Pierre-Emerick Aubameyang is still welcome at Borussia Dortmund despite his most recent suspension.
Sources said left-back Chris Gloster, 17, and attacker Zyen Jones, also 17, have spent time with the club on trial.
Stafylidis, 24, becomes first addition since Paul Lambert's appointment as manager on Monday.
Michael Zorc also hit out at Arsene Wenger for the Arsenal manager's statement on Pierre-Emerick Aubameyang.
Robben, 33, is in the final few months of his deal at the Allianz Arena, having made 272 appearances for Bayern in all competitions.
Breaking up is hard to do, as Pierre-Emerick Aubameyang demonstrates as he seems set to leave Borussia Dortmund for Arsenal, writes Raf Honigstein.