Doubt over second legs
Last night's 5-nil Europa League last-16 first leg win for Manchester United over LASK was played behind closed doors in Austria as a precaution.
Nigerian striker Odion Ighalo scored his fourth goal in three starts.
Elsewhere Wolves earned a 1-all draw at Olympiakos, in a game also played with no fans in attendance.
While Rangers lost 3-1 at home to Bayer Leverkusen.
Quite when those second legs are played may be determined by a meeting of UEFA's stakeholders next Tuesday.