And sub Jesse Lingard ALSO limped off injured before half-time in a dramatic Sunday afternoon at Old Trafford.
Andres Pereira came on the pitch after Herrera asked to be replaced just 20 minutes into the game with what appeared to be a hamstring problem.
And shortly after fellow Spaniard Mata – substituted by Lingard – was also going down the tunnel due to a hip issue in a further injury blow to Ole Gunnar Solskjaer.
But the English winger lasted only 15 minutes as he limped off the pitch after being tripped by Liverpool goalkeeper Alisson.
In addition, Marcus Rashford spent most of the first half of the clash seemingly limping, but the Norwegian coach decided to keep the 21-year-old striker on the pitch.
But the Red Devils were not the only unfortunate side in what turned out to be a dramatic Sunday afternoon, as they lost Roberto Firmino just before the half our mark with an ankle injury.
United's injury crisis deepens as the three players join Nemanja Matic and Anthony Martial on the sidelines.
The Frenchman is still not fit after pulling his groin in the Champions League defeat to Paris Saint-Germain.
And the 30-year-old Serbian got injured in training and is expected to be out for two weeks.
Interestingly, Solskjaer decided to start Scott McTominay and Mata against archrivals Liverpool amid the crisis.
Meanwhile, £52m man Fred still struggles with playing time and was an unused sub against the Reds – even though United's two midfielders had to leave the pitch early.
And Alexis Sanchez only got on when Lingard – who was not fully fit ahead of the clash – suffered another injury just 15 minutes after coming on the pitch.
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