Pablo Sarabia’s 77th-minute free-kick condemned the Reds to a disappointing 1-0 defeat at Old Trafford, where the much-changed Reds had numerous goalscoring opportunities but could not capitalise upon them.
Ruben rotated the squad to freshen things up following Thursday’s epic extra-time victory over Lyon in the Europa League and was impressed with debutant Tyler Fredricson and fellow youngster Harry Amass.
Scroll down to read our head coach’s thoughts, speaking with MUTV, BBC Sport and Sky Sports…
YOU HAVE TO SCORE TO WIN
“It’s easy to review this game. They scored in the only opportunity they had, we had many chances and we didn’t score.