The managers of English clubs Manchester United and Chelsea both remained upbeat after their clubs producing disappointing results in the first legs of their UEFA Champions League quarterfinal series.

Goals by Rodrigo Taddei and Mirko Vucinic gave Roma a 2-1 win over Premier League leader Manchester United, which played the last 56 minutes with 10 men after Paul Scholes picked up a second booking. Didier Drogba earned Chelsea a 1-1 tie with Valencia in London when he scored a goal early in the second half to cancel out David Villa's strike.

United's only goal came on a volley by Wayne Rooney, his first goal in the Champions League since a hat trick in his debut in September 2004. United lost for the first time in 15 games, but Manager Alex Ferguson was confident of reaching the semifinals.

"Over the years we've had some great teams come to Old Trafford," he said, "but if we score we will go through. That's my opinion."

United had warned its fans to anticipate trouble at the game in Rome, and, sure enough, United fans were the victims of what the English press termed "heavy-handed policing." Riot police waded into the United section after trouble erupted between Roma and United fans following Taddei's goal.

Chelsea manager Jose Mourinho, for his part, put a brave face after the Blues' tie left them needing to score and earn at least a tie in next Tuesday's second leg in Spain. Mourinho said it would be premature to say the Spanish club had the inside track on a spot in the final four.

"Maybe everyone thinks they are one step ahead and enjoying this result," he said, "but if I was in their place, I would be very cautious. I imagine the Valencia players feel more comfortable playing at their Mestalla Stadium than here. But if we have a good referee, not influenced by the enthusiastic atmosphere, why can't we get a result there?"