WES BROWN knows Manchester United must improve defensively on Sunday afternoon.

The Reds conceded three times against CSKA Moscow in a 3-3 UEFA Champions League draw on Tuesday, and Brown knows they must improve when they head to Chelsea this weekend.

"We've definitely got to play better at Stamford Bridge and keep it tight at the back," the 21-time capped England international told MUTV. “Chelsea are playing very well at the moment.

"They're a strong side, well organised and they're scoring a lot of goals. We're going to have to go there and play really well if we're to come away with any points."

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