The Spaniard came back into the starting XI after recovering from a knock sustained against Tottenham Hotspur, training with the squad for the first time on Tuesday.
But he wouldn’t last long in Seville, racing to flick back a ball into Antonio Valencia‘s direction only to immediately signal to the bench, slamming his boot on the floor in frustration.
And Mourinho, speaking after the game, claimed that Herrera’s injury, which looked like a pulled hamstring, was a bad one.
With Marouane Fellaini out until late March and a series of important games on the horizon, Mourinho would have been desperate to keep all of his midfield options raring to go.
But to include Herrera in what was a tempered, combative affair having only training with the first team once, whilst leaving Paul Pogba – a man with a point to prove – on the bench, was one of Mourinho’s most maligned decisions of his time at Old Trafford.
Supporters will expect Man United’s midfield, and Pogba in particular, to offer more dynamism and intent in the second leg.