Manchester United supporters feel that the Reds will have to improve on their set pieces to overturn the 1-0 deficit against Barcelona and secure their passage to the Champions League semi-final.
Luis Suarez's 13th-minute header came off Luke Shaw to hand Barcelona an early lead at Old Trafford but United grew into the game thereafter, asking considerable questions of Barcelona's back four.
Scott McTominay played out of his skin at the heart of United's midfield - as he did against Paris Saint-Germain in the previous round's second leg - and broke up the play to afford United's wide man with opportunities to lay on crosses for Marcus Rashford and Romelu Lukau up front.
But the Reds were guilty of squandering their chances to deliver testing balls - Ashley Young was notably poor - and United supporters on Twitter expressed their concern about that facet of Ole Gunnar Solskjaer's side's game ahead of the second leg at the Camp Nou on Tuesday night.
'What do they do in training?'
'Have to be better'
Specialist required
'United's speciality'
Ashley Young was a perpetrator
It's a serious concern
Solskjaer must take action in the summer
