Manchester United defender Rio Ferdinand is a concern for the Champions League clash against Inter Milan this week after picking up an ankle injury in the FA Cup quarter-final win over Fulham.
Ferdinand was taken off at half-time and left Craven Cottage with a protective boot on his right foot following the 4-0 win, courtesy of two goals from Carlos Tevez and strikes from Wayne Rooney and Ji-sung Park.
"Ferdinand is a bit of a concern," Ferguson said. "He went over on his ankle and I hope he is alright for Wednesday because he is so important to us."
United made it through to a record 26th semi-final, largely thanks to Tevez's two first-half strikes, the first a far-post header and the second a fearsome drive.
"It was a superb performance, he has so much great energy," Ferguson said. "He was a jack in the box all day."
Rooney added his goal just after the break, then Park scored nine minutes before full-time.
"Everyone was fit and fresh and bursting to play," Ferguson said.
"It was exciting right from the word go, with energy and enjoyment.
"But it was a tricky tie, Fulham were in form and we had to respect that. The last thing we needed was a draw."
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