The match against Bremen is in the middle of Bayern's two-legged Champions League semi-final against Real Madrid.

Having defeated Madrid 2-1 on Tuesday, Bayern have a great chance to qualify for the Champions League final, which will be held at their stadium in Munich, but Heynckes has refused to let that potential prize distract his players.

"I think it is our duty to take the game tomorrow seriously," Heynckes said.

"The preparation will be the same with training and looking at the opponent."

But although he has promised 100 percent focus, the 66-year-old will change his starting side against Bremen.

"I will make some changes in the first 11," Heynckes said. "I have to investigate who is groggy or tired.

"With this in mind I will find my starting team."

Bayern are eight points behind leaders Borussia Dortmund on the Bundesliga table with three games remaining.