Ralf Rangnick is unsure why Marcus Rashford is struggling to make an impact after the Manchester United forward toiled in Monday's narrow 1-0 FA Cup win against Aston Villa.
Liverpool great Steven Gerrard's first match as a manager at Old Trafford was an entertaining occasion settled by Scott McTominay's header in the eighth minute.
Villa had two second-half goals ruled out, the first after a lengthy video assistant referee review, but United had some opportunities to put the game to bed earlier.
Rashford was guilty of some poor decision-making in a couple of those moments and some met his substitution with sarcastic cheers.