Cristiano Ronaldo came on to a rapturous ovation on his return to the Manchester United side as a second-half substitute against Villarreal this evening, but he was unable to inspire Old Trafford side to victory as they were held to a goalless draw

The Portugal winger, who was desperate for a move to Real Madrid in the summer, has been recovering from ankle surgery and was introduced for Ji Sung Park in an attempt to break down a stubborn Spanish side who came closest to opening the scoring in the second half when they hit the inside of a post.

Arsenal fell behind in Kiev after Bacary Sagna conceded a 64th-minute penalty which was coolly converted by Ishmael Bangoura, who sent Manuel Almunia the wrong way. Arsene Wenger's side snatched a point two minutes from time, with William Gallas, the c aptain, bundling home a right-wing cross from Theo Walcott.

Celtic endured a frustrating night at home to Aalborg of Denmark, who are managed by Bruce Rioch, the former Scotland manager, and like United were held to a goalless draw. Barry Robson wasted a glorious opportunity to give the home side the lead, seeing his penalty saved by Zaza, the Moroccan. The Danes were reduced to ten men near the end, Michael Beauchamp being dismissed for a professional foul on Georgios Samaras that was actually committed by his team-mate, Michael Jakobsen.

Full-time scores

Group E

Manchester United 0
Villarreal 0

Celtic 0
Aalborg 0

Group G

Dynamo Kiev 1 (Bangoura pen 64)
Arsenal 1 (Gallas 88)

Team news

Cristiano Ronaldo was named on the bench as Manchester United began the defence of their Champions League crown at home to Villarreal.