Manchester United duo Wayne Rooney and Nemanja Vidic are doubts for Tuesday night's Champions League semi-final second leg against Barcelona at Old Trafford after both sat out training on Monday morning.

Rooney took a knock to his hip before scoring the equaliser in the 2-1 defeat by Chelsea while Vidic suffered a facial injury.

United are aiming to book a place in the final in Moscow after a 0-0 draw at the Nou Camp.

A four-man group comprising Rio Ferdinand, Owen Hargreaves, Michael Carrick and Wes Brown trained away for the rest of the squad at the beginning of the session.

With United looking to book a place in the final, they will be banking on Rooney to recover on time.

The England striker took his tally for the season to 18 goals at Stamford Bridge.

Serbian centre-back Vidic, who missed the first leg because of a stomach infection, saw just eight minutes of action against Chelsea.

He was stretchered off after taking a knee in the face following a tussle with Didier Drogba.

Darren Fletcher is looking to retain his place in the side after making his comeback from a knee injury against Chelsea.

Barcelona coach Frank Rijkaard has kept faith with the majority of the squad that played in last week's first leg.

Captain Carles Puyol returns after being suspended for the goalless draw at the Nou Camp and takes the place of Rafael Marquez, who in turn serves a ban of his own.

The only other change sees Brazilian utility man Edmilson, who was injured for the first meeting, drafted back in with young Mexican forward Giovani dos Santos the player to make way.

Ronaldinho and back-up goalkeeper Albert Jorquera remain sidelined through injury, while Oleguer and Santi Ezquerro have been omitted from an 18-man squad by Rijkaard.

Midfielder Yaya Toure was unable to take part in squad training on Sunday morning after picking up an ankle knock during Saturday's 2-0 league defeat at Deportivo La Coruna, but he has also been included in the travelling party for England.