The England striker was sent to the hot African climate to speed up his recovery from a groin problem, resting him from the weekend Barclays Premier League victory at Old Trafford.
And United manager David Moyes will be hoping his plan will have paid off with a trip to championship contenders Chelsea on Sunday.
Raising a smile: Wayne Rooney (centre) happily
poses for a picture with fans during a break from his warm weather
training in Egypt
The Scot looks almost certain to be without Robin van Persie at Stamford Bridge, with the Dutchman's return date from a thigh problem that has kept him out for a month presently unknown.
Rooney, who is joined in Egypt with a club fitness coach, happily posed for a picture with fans at his hotel and United will hope he has responded well to his training and have back Manchester this week. He hasn't played since the New Year's Day defeat by Tottenham.
Normally, a trip to Stamford Bridge would not be an occasion to relish.
However, having won there last year and with present expectations so low, it might turn out to be the best test United could be presented with.
Out of action: Rooney has not played since the New Year's Day defeat by Tottenham
Missing man: Robin van Persie's return from a thigh problem could be weeks away
'We will be all right,' said midfielder Darren Fletcher.
'Sometimes in bigger games you really come together. It brings out your best performances because you are really focused and really intent on proving people wrong.
'Going to Chelsea is a great challenge.
'We can take some confidence from beating Swansea and are fully confident of going down there and getting more of the same.'
Doing the business: Danny welbeck has lead
United's attack in Rooney and Van Persie's absence, scoring in the win
against Swansea on Saturday
