Barcelona were held at home 2-2 in the opening match of the Champions League group stages after a late equaliser by AC Milan.

Alexandre Pato, Milan’s striker, was so fast out of the blocks that his goal in the Camp Nou was timed at 24 seconds after the kickoff. “Usain Bolt wouldn’t have caught him,” quipped Pep Guardiola, the Barcelona coach.

Another late goal in Dortmund dented Arsenal’s hopes of a first win while Chelsea cruised past Bayer Leverkusen 2-0.

David Luiz has described his joy after scoring for Chelsea in his first appearance of the season.

He told the club’s official website: “It was good. It is a long time I didn’t play and this game I played 75 minutes and it is good for me, and it is important inside my body that I came back for the game. My leg is good, it is normal.

“It was a nice goal. In training we shoot with the strikers.

“Now I have three goals at Stamford Bridge and I am very happy. I love the atmosphere here, the support, and all the time the players are together and this is of big importance.”

Tonight Manchester United started their campaign against Benfica while neighbours City host Napoli in their first ever game in the competition.

Real Madrid face a tricky away trip to Dinamo Zagreb while Bayern Munich travel to Villarreal.