Rooney went over on his right ankle in the dying moments of United's 2-1 Champions League quarter-final first leg defeat to Bayern Munich in Germany on Tuesday, sparking fears that his season could be over.
Related ArticlesAncelotti: Didier Drogba has hernia problemLaws: choosing Mike Dean to ref United v Chelsea 'mad'Manchester United v Chelsea: previewFerguson to outline Rooney returnAncelotti: Rooney injury gives us advantageTitle run-in: key clashesHowever, Rooney's injury was confirmed as a minor ligament strain by the club yesterday and Ferguson said this morning that the England international would be back within two to three weeks.
That rules Rooney out of the second leg of the tie against Bayern and a potentially decisive Premier League match against Chelsea on Saturday.
However, he could now make his return as early as the April 17 derby against Manchester City.
'(There is) no bone damage or serious ligament damage. The nation can stop praying,' said Ferguson, referencing the state of national concern over the wellbeing of the country's leading player this close to the World Cup finals.
"It was panic. We are relieved," he added. "When we saw him hobble off, you are hoping when you send him for a scan, you get some good news
"And it could have been worse given the way he hobbled off.
"But it's out of the way, we can put it to one side and get on with our job on the pitch."