The Scot says his men are now in a "fantastic position" to win the Premier League title after moving 12 points clear at the top with a 2-0 victory over the Toffees at Old Trafford.
The Red Devils moved 12 points clear at the top of the table with victory over the Toffees, courtesy of goals from Ryan Giggs and Robin van Persie and Sir Alex admitted it was a crucial win.
“I did [change my team after seeing Manchester City result]. I thought that this is going to be a more important game today, because it can give us an important lead and we can make changes later,” he told Sky Sports.
“We knew that if we could get a result today it puts us in a fantastic position. We've got to win our games, it doesn’t matter what happens to Manchester City, I’ve always said we have to concentrate on our own games and we’ll be OK.”
Veteran Giggs struck early on, to continue his record of having scored in every Premier League season, and Sir Alex was full of praise for the Welshman.
“His legacy lives on, he’s a fantastic human being, today again 39 years of age, he’s up and down that pitch all day and showing fantastic energy. It’s wonderful to see,” he added.
“The first half, for 20 minutes I thought they dominated, a couple of near things, corners are always a threat, great delivery from Baines, and we saw that through Second half we were much better without scoring the goals, we were really in control.”
United now heads to Madrid to take on Real in the Champions League on Wednesday and Sir Alex is looking forward to the clash.
“I had a chat with Mourinho [before the game]. He had a great result yesterday,” he said. “It should be a fantastic game on Wednesday, I just hope we can get the team out on the pitch that I want.”