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Sir Alex Ferguson says Premier League leaders Manchester United will not be complacent after their advantage was cut to 12 points following Monday's 2-1 defeat by Manchester City.

United held an eight-point lead over City last term before losing the title on goal difference on the final day.

But they are still favourites to regain the crown with seven games left.

"If you look at our history over the years we always make it difficult for ourselves," said United boss Ferguson.

"The supporters are hanging on the edge of their seats every year. It is a 12-point lead, we go to Stoke at the weekend and we will have a go."

United held a commanding advantage over City 12 months ago, but defeat at Wigan and a home draw against Everton, before a 1-0 loss at Etihad Stadium, swung the title race in favour of their rivals.

Now, United knew they could stretch their lead over second-placed City to 18 points with a win at Old Trafford, moving them within touching distance of a 20th domestic title.

But they fell behind to James Milner's opener and, despite an own goal from City skipper Vincent Kompany, were beaten by substitute Sergio Aguero's superb winner.

Aguero's intervention sent United to their first top-flight defeat in 18 matches, while Roberto Mancini's men extended their advantage over third-placed Chelsea to seven points.

"It wasn't a bad performance by us, so I'm not disappointed in that respect," added Ferguson. "But I'm disappointed with the goals we gave away.

"For the first goal I thought their player [Carlos Tevez] was offside and interfering with play by standing in front of David de Gea.

"I think we were unlucky to lose the game. But it is easy to see why these were the best two teams in the country - the evidence was there tonight."