Manchester United boss Sir Alex Ferguson admits the return to fitness of Rio Ferdinand is a huge boost.
The England defender has returned just in time for the decisive games.
"Rio's experience showed itself in the first leg against Chelsea," said Ferguson. "He was immense.
"Experience and ability is vital in the situations we have at the moment. He's fresh and ready to play and it's a big boost for us."
Click here for the No1 coverage of all the gossip and transfer news around Manchester United.