Champions League: the best pictures from Wednesday's games

He's back. Cristiano Ronaldo looks on from the bench prior to the Group E match between Manchester United and Villarreal at Old Trafford Photograph: Alex Livesey/Getty

FC Porto's Lisandro Lopez celebrates after scoring past Fenerbahce's goalkeeper Volkan Demirel during their Group G match at the Dragao Stadium Photograph: Paulo Duarte/AP

Celtic's Barry Robson has his penalty kick saved by the legs of Aalborg's keeper Karim Zaza Photograph: Scott Heppell/AP

Fiorentina's Alberto Gilardino reacts after scoring their second goal against Lyon Photograph: Lionel Cironneau/AP

Bayern Munich's Luca Toni stretches for the ball at the Ghencea Stadium in Bucharest Photograph: Robert Ghement/EPA

Ismael Bangoura sends Manuel Almunia the wrong way to leave the Gunners trailing in the Valery Lobanovskiy Stadium Photograph: Michael Regan/Action images

Having failed to make the breakthrough against Villarreal after 62 minutes, Manchester United threw the returning Cristiano Ronaldo into the fray Photograph: Alex Livesey/Getty

Theo Walcott cuts a dejected figure following the Ismael Bangoura penalty that handed Dynamo Kyiv a 64th-minute lead at the Valery Lobanovskiy Stadium Photograph: Michael Regan/Action images

Alessandro Del Piero celebrates in style after breaking the deadlock in Turin Photograph: Giampiero Sposito/Reuters

Captain William Gallas pokes the ball over the line to secure a point for Arsenal in Kyiv Photograph: Michael Regan/Action images

Despite Ronaldo's second-half introduction, it proved a frustrating night for Manchester United at Old Trafford Photograph: Martin Rickett/PA

As the Kiev defence appeal in vain for offside, Gallas celebrates his late equaliser in effusive fashion Photograph: Mike Hewitt/Getty

Daniel van Buyten is mobbed by his team-mates after scoring against Steaua Bucharest to ensure a winning return to Europe's top table for Bayern Munich Photograph: Vladimir Rys/Getty

Porto underlined the challenge facing Arsenal in Group G with a 3-1 win over Fenerbahce at the Dragao Stadium Photograph: Armando Franca/AP