Manchester United striker Wayne Rooney has warned his side against conceding an early goal against Chelsea on Sunday.

Sir Alex Ferguson's team will head into the Premier League clash four points behind the leaders in third place.

"We don't want to be doing that (conceding early again) and against the best teams it will be difficult to get those goals to win games," he said.

"It happened against Braga [in the Champions League in midweek] and we did well to get back into the game and win it, but you can't afford to be going one or two goals down against Chelsea away – although we did last season.

"We went 3-0 down before we drew. But we can't do that again."

United have won three and lost one of their four away games in the Premier League this season.