Rival City fell to a 1-0 defeat at the hands of Swansea, allowing the Red Devils to move one point clear at the summit. Wayne Rooney scored twice to guide his side to victory over the Baggies at Old Trafford.
Despite the slender advantage, Ferguson admits there’s still a long road ahead before a winner is crowned.
“That was a bonus I didn’t expect that maybe. At this time of the season points will be dropped and you have to make sure you don’t drop as many as your opponents," he told MUTV.
“If you can keep winning, that is the name of the game for both of us. If you keep winning, the games whittle away and you run out of games.”
Sir Alex added on Sky Sports News: “You don’t mind but I don’t care about being top of the league just now. I’m happy to be there because only a few weeks ago we were five/seven points behind them and now we’re one point ahead.”
“So we’ve turned around eight points and that’s credit to the players and also the resilience of our squad because as everyone knows we’ve had a lot of injuries.”
The 60-year-old was pleased with the way his team played but feels the manner of victory could have been more emphatic had the Red Devils taken all of the chances on offer.
“It was a great performance. It took us a little bit of time to get the rhythm of our game right but once we got that we played some exciting stuff. It was really good football," Ferguson told MUTV.
“We could have scored a lot of goals. If there is a criticism, that is it. But all over the pitch we produced a sterling performance. There was a real will to win and we are well please with that part."
Sir Alex hailed the performance of double-goalscorer Rooney and hopes he can continue his current form, which the Scot described as his best, until the end of the season.
“If Wayne gets to 40 goals I will be absolutely delighted because we will be in business then! He is on a hot streak which is what he does,” he said, according to MUTV.
“His first goal was fantastic. I thought his first goal might have been offside because he was so clear but when you see his timing of the run it was fantastic. It was a really good finish.”