Sir Alex Ferguson admits he and his players had one eye on Tuesday's tricky trip to Birmingham, during a comfortable Boxing Day victory over Sunderland.
United quickly forged ahead through Dimitar Berbatov's header against the Black Cats and, after the Bulgarian had doubled his tally after the break, the game's pace dipped markedly for the final half-hour. With Birmingham's trip to Everton waylaid by frozen pipes at Goodison Park, Sir Alex admits he will have to factor in the midlanders' added freshness.
"It was a comfortable performance," the manager told MUTV. "I think in the first half we were absolutely fantastic; it could have been any score. Second half I thought we maybe put our tools away a bit and saved our legs. We knew the Birmingham game was off and they were very economical in the second half, put it that way.
"You have to. I took Anderson and Ryan off. We've got a game in two days' time of course, and with Birmingham not having played they'll be nice and fresh."