European football's governing body, though, stopped short of launching a formal investigation, saying it had not received a formal complaint from the Dutch football federation (KNVB).

The revelations, which follow comments published on Friday from team captain Mark van Bommel in the Dutch newspaper De Telegraaf, could not have come at a worse time for Euro 2012 organizers, with the tournament due to kick off on Friday evening.

Co-hosts Poland and Ukraine have already been forced to reject claims that racist violence is rife at their football grounds, which has led to governments of some participating nations to warn traveling fans to be on their guard.