Unfortunately FCSB could not give competition to Man utd, currently the match has entered the second half and you know Man utd has dominated since the first half and in the second half they have scored one goal through Diogo Dalot in the 60th minute. If you look at FCSB's performance, they are bad as the home team, 30% ball possession, 5 shots, 0 on target. As I was typing Kobbie Maino widened Man utd's lead. I think this is a victory that is in sight for Amorim's troops, they just need to maintain it until the end of the match or will continue to score goals, who knows, because FCSB is helpless at this time.
Playing bigger clubs like the English teams, Spanish sides, and German sides in Europe champions league are not always easy to win no matter how strong you might have looked in your local league, these top leagues are always having dominations over other European club don't know why. The Romanian side FCSB have been doing pretty well in league games but that can't count them winning against man utd because the international competitive experience is not there, even though Manchester United is doing average in the EPL, it doesn't affect their other competition with other small clubs in the Europe.
Besides, FCSB had been slagging behind with lots of draws in their last five games in the competition, that can't guarantee them winning against English top side., it's really sick.