Preview: Ronaldinho will return for Barcelona tomorrow. The Brazilian playmaker was not suffering from any specific injury, just "a series of knocks" and has not played since the quarter-final victory over Benfica.

Refael Marquez and Thiago Motta are also back but Lionel Messi, Deco and Henrik Larsson and Xavi are unavailable.

There was no new injury concerns reported from the AC Milan camp following their 1-0 victory over Inter on Friday.Villarreal centre-back Gonzalo Rodriguez will miss the match at Highbury and waved goodbye to his chances of going to the World Cup with Argentina after tearing a ligament in his left ankle.

Villarreal said the 21-year-old, who suffered the injury in his side's 1-0 defeat against Barcelona on Friday, would need three weeks complete rest and another month's treatment before he would be able to start training again.

Fellow Villarreal centre back Juan Manuel Pena will also miss Wednesday's game after straining a knee ligament in the Barcelona game.

The club said that the Bolivian international would also be a doubt for the return leg on April 25th.

Tuesday (7.45) AC Milan v Barcelona

Wednesday (7.45) Arsenal v Villarreal