Borussia Dortmund`s Westfalenstadion stadium was evacuated on Thursday after an unexploded WWII bomb was found during renovation work, the club announced.
The 250kg bomb (551 lbs) was found during morning work on the stadium`s VIP area and the surrounding area was quickly evacuated with a scheduled press conference moved to the club`s training ground.
The bomb, believed to have been of British origin, was expected to be defused in the afternoon.
Dortmund, German champions in 2011 and 2012, host rivals Schalke on Saturday in the Ruhr Valley derby with a sell-out 80,700-capacity crowd expected.
Borussia will also play their next Champions League match at the Westfalenstadion on March 18 when they host Juventus looking to over-turn a 2-1 defeat from the last 16, first-leg clash.