MUNICH -- Bayern Munich have received an injury setback with captain Thomas Muller ruled out for three weeks with a hamstring strain.
Muller, 28, suffered the injury in Bayern's 1-0 Bundesliga victory over Hamburg on Saturday, which moved the reigning champions level on points with leaders Borussia Dortmund at the top of the table.
Muller replaced James Rodriguez as a half-time substitute in Hamburg, but after setting up Corentin Tolisso on 52 minutes, he was forced off three minutes later after tweaking a right thigh muscle in the build-up to the goal.
Muller has now provided an assist in each of Jupp Heynckes' opening three wins in charge since the 72-year-old's return for a fourth spell -- also laying on goals in the 5-0 Bundesliga win over Freiburg and the 3-0 victory last week over Celtic in the Champions League.
Arjen Robben told reporters after the game: "It is always a worry when a player goes off injured, we don't need that at all. Thomas is extremely important and our captain as well at the moment. It would be bitter if he's ruled out."
Muller will miss Bayern's DFB Pokal game on Wednesday at RB Leipzig and the two sides' Bundesliga meeting on Saturday in Munich.
The Germany international will also sit out the return fixture in Glasgow against Celtic in the Champions League next Tuesday and the top-of-the-table clash in the Bundesliga a week on Saturday against Dortmund.
Meanwhile, Mats Hummels also picked up an ankle injury at the weekend and is a doubt for Wednesday's game at Leipzig, according to Bild.
However, in more positive news, Javi Martinez returned to training on Sunday after missing Bayern's last two games with a shoulder injury and could return to the squad for the trip to Leipzig.