Manchester United boss Sir Alex Ferguson was unhappy with Dimitar Berbatov's wayward finishing in their 1-0 win at Sunderland.

Nani struck the winner for United to keep the pressure on Premiership leaders Chelsea.

Ferguson was less enamoured with Berbatov, substituting the Bulgarian after two second-half misses inside the six-yard area.

"We were frivolous," he said. "We had an awful lot of chances, but we wasted a lot, too, and towards the end I was beginning to think they were going to score because 1-0 isn't a healthy score. It was just careless finishing. Dimitar could have scored four."