Manchester United manager Sir Alex Ferguson says last-month hammering at the hands of Manchester City provided a much-needed wake-up call for his side.

United have failed to concede a goal since letting in six against their near-neighbors, with the latest shut-out coming against Swansea City.

Javier Hernandez’s goal was enough to ensure United collected their first ever league win in Swansea, another sign United are getting over their derby disappointment.

"The game against Manchester City was a wake-up call for us," said Ferguson. "Over the years our defence has been an integral part of our success and I thought we did well in that area.

"Swansea are a good footballing side and they keep the ball well. Against a side like that, you have to be concentrating all the time and we need to get that concentration back in the team.

"A couple of weeks ago, there was a genuine criticism about our defending and the chances the opponents were getting.

"We had to make sure that we defended well and we did that apart from the miss when Michael Carrick slipped up. Having said that, I thought Michael was magnificent.

"Other than that slip, we were comfortable with our defending and for me, it's a good result in the context of how Swansea have been doing this season."

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