Bayern Munich coach Jupp Heynckes says there'll be no split loyalties facing Champions League semifinal opponents Real Madrid.

Heynckes led Real to glory in the 1998 Champions League and spent eight years coaching in Spain.

"Of course I know Real Madrid very well, but I have got to say they are even more dangerous and effective this season," he said.

"Spanish football is currently leading the way at the moment. Barcelona are defining a new era.

"It is going to be an interesting match tomorrow between two sides with a great tradition - between two of the best sides in Europe."