German police arrested a man on Friday who is suspected of planting explosives targeting the bus of soccer team Borussia Dortmund last week, the office of the German federal chief prosecutor said.

Borussia Dortmund CEO Hans-Joachim Watzke says he flirted with pulling the club out of the Champions League after Tuesday's team bus attack before resolving not to give in to the bombers.

German prosecutors issued an arrest warrant against a 26-year-old Iraqi man detained following an attack on a bus carrying players of a top soccer team, saying on Thursday they believed he was a member of Islamic State.

Three bombs hidden in a hedge that exploded when the Borussia Dortmund Champions League team passed by proved that no sporting event is now safe from a militant attack, experts said.

They lost the game, but realised there is more to life than soccer.

Spain international Marc Bartra underwent wrist surgery on Tuesday after being injured when the Borussia Dortmund team bus was rocked by a series of explosions that forced the postponement of their Champions League match against Monaco.

Security has been tightened around the star-studded Real Madrid squad, led by superstar Cristiano Ronaldo, for Wednesday's Champions League match at Bayern Munich following the Dortmund team bus blast.