Ole Gunnar Solskjaer knows Manchester United have to get back to winning ways in the Premier League at West Bromwich Albion and kick on heading into a crucial stage of the season.
An impressive festive period saw the Red Devils enter the halfway point of a season top of the standings for the first time since Sir Alex Ferguson retired as champion in 2012/13.
United were top until City thrashed West Brom on January 26, with Solskjaer's men wasting the chance to return to the summit when falling to a shock 2-1 home loss to rock-bottom Sheffield United the following night.
Pep Guardiola's men have kept their foot down since then and now sit five points clear with a game in hand after second-placed United drew with Arsenal and Everton either side of the 9-0 annihilation of nine-man Southampton.
Tuesday's 1-0 extra-time win against West Ham in the FA Cup fifth round provided a welcome shot in the arm but Solskjaer knows they cannot afford any slip ups against Sam Allardyce's Baggies on Sunday.
"Of course it's an important game for us this weekend," the United manager, who saw Leicester City jump into second place on Saturday after their 3-1 win over Liverpool, said.
"It's an important spell. It's time now that every game you tick one off and there's less and less possibility to catch up on points on the teams in front of you.
"That's what we want to do. That's what we're here to do. Sunday's a big one for us in that respect to get back on winning ways.
"The two points dropped against Everton was disappointing when it's the last kick of the game.
"But we bounced back really well in the cup against West Ham. We're through, we're in the quarters and that was a good step in the right direction again, another clean sheet."
Tuesday's win over the Hammers helped shake off the disappointment of Dominic Calvert-Lewin securing Everton a 3-3 league draw with the last kick of the ball last Saturday.
An FA Cup quarter-final trip to Leicester is the reward for United, who are still in with a shot at Premier League glory and start their Europa League campaign this week against Real Sociedad in the last-32.
Asked what he sees as a successful season for United and at which point his success has to be measured in trophies, Solskjaer said: "You always go into every season trying to improve.
"If you improve, that's a step forward. Is it a big enough step forward? We'll have to see at the end.
"If we end up with trophies. We're still in competitions. We lost in the semis of the Carabao Cup [to Man City], we're in the quarters of the FA Cup, we're still in Europe and we're second in the league.
"At the moment it looks like we've improved but we're going into the deciding period of the season so it's now that we have to kick on."
_____________________________________________________________
Manchester United 1 West Ham 0: FA Cup player ratings
