Chelsea manager Andre Villas-Boas believes that Manchester United will provide his side with a "good challenge" this weekend.

Last season's top two teams in the Premier League meet at Old Trafford on Sunday afternoon and Villas-Boas has praised the way that the Red Devils have begun the campaign.

"We will go there to try to win it. It's going to be a very good early-season game," said the Blues boss, who was speaking after his team's 2-0 victory over Bayer Leverkusen last night.

"We face United perhaps in their most tremendous moment of motivation and flair and style.

"A team that has made its impact at the beginning of the Premier League is different from last year, but I think it provokes in us a good challenge."

Villas-Boas also failed to confirm whether Didier Drogba would recover from concussion in time for the trip to Manchester.