Ruben stated United's performance against Everton was not as strong as those produced in the wins over West Ham and Bournemouth.
He believes that is a timely reminder there is still a lot of work to do before the competitive season begins with that highly anticipated Premier League opener against Arsenal.
Nevertheless, there were positives to take from Atlanta and those include Mason Mount, who scored a lovely goal as a second-half substitute.
“He does everything 100 per cent. Every training and every game, he is always the same player. The only thing for you to maintain the consistency is that you have to work, and he works a lot.”