BAYERN Munich star Thomas Muller has been ruled out of his side's Champions League trip to Celtic through injury.

The German champions travel to Parkhead on 31 October for their second meeting of the group stage after a 3-0 win in Munich last week.

World Cup winner Muller opened the scoring for Jupp Heynckes' team at the Allianz Arena, but the striker suffered a thigh injury during Saturday's Bundesliga win away to Hamburg. 

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The 28-year-old is expected to be sidelined for three weeks and will miss the Group B fixture.

He has been in top form since Heynckes replaced Carlo Ancelotti on the Bayern bench, scoring three goals in his last three games in all competitions. 

Teammates Franck Ribery and Manuel Neuer will also miss the game with injury problems.