Cape Town - Chris Smalling reassured the club's fans that they will see a "different Manchester United" when the side runs out again.
Manchester United succumbed 3-0 to a spirited Everton side on Sunday which has seen the Red Devils fall deeper into a fight for Champions League qualification.
“Right from the first minute we were off the pace and they had a pressure that we usually have," the England defender told MUTV.
"We were second best. This is a massive wake-up call for us.
“I think it was always going to go down to the final couple of games. We’ve got four big games now in which we’ve got to make sure we were better than today. I think we’ll go back and look at the video tomorrow and, come the next training session, we’ll be eager to put this right.
"We haven’t been the second-best team in games this season, even when we’ve lost, we’ve always had that aggression and those tackles but today we were far from it. I think we’ll see a different Manchester United next Saturday against West Brom."
Manchester United's remaining fixtures:
West Bromwich Albion (home)
Crystal Palace (away)
Hull City (away)