Patrice Evra admits it would be a "nightmare" to head into the eagerly-anticipated Champions League tie with Real Madrid on the back of a shock defeat to Norwich.
The Barclays Premier League leaders can extend the gap at the top to 15 points with Manchester City not in action until Monday evening and Sir Alex Ferguson has drummed the message into his players that one game must be taken at a time.
So any talk of a potential Treble understandably irks the left-back, who will only start thinking about Real once the final whistle sounds on Saturday at Old Trafford.
"Every game is important now," he told MUTV. "I hear a lot of people talking about the Treble and this is the wrong way [to do it] - you have to think game-after-game.
"If we start to think about Madrid before Norwich, then you lose to Norwich. It's a big game and we have to win - if we go into Tuesday after losing against Norwich, it's going to be a nightmare.
"Of course, Norwich are going to come here for a win. Don't forget, we lost three points away. I know it was a difficult game but every team comes to win against Manchester United.
"I think the boss will pick a strong side. We have to be careful against Norwich, even if we have to rest some players, and have to play for winning that game. There can be a lot of talk if we lose and maybe City win their game [at Aston Villa] and are going to get back [in the race] for the Premier League.
"The Premier League is the priority. We won't think about Madrid until Saturday, just after the game, and then we will have our recovery on Sunday.