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Stafylidis, 24, becomes first addition since Paul Lambert's appointment as manager on Monday.
Michael Zorc has hit out at Arsene Wenger for the Arsenal manager's statement on Borussia Dortmund's 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.
Borussia Dortmund head coach Peter Stoger has said he assumes Pierre-Emerick Aubameyang will remain at the club amid interest from Arsenal.
The United States international missed Dortmund's goalless draw against Wolfsburg on Sunday with muscular problems but has resumed training.