Pakistan eased to their victory target of 179 with 18 balls remaining in the series decider
Rooney, who signed a new five-year contract at Old Trafford last week after first shocking the club by saying he wanted to leave, is currently on holiday recovering from an ankle injury.
When asked at a press conference Friday if three weeks was still the prognosis for his return, Ferguson said: “I think it may be longer.”
Rooney was injured in training last week following a challenge with team-mate Paul Scholes.
The 25-year-old has since been given permission to travel to Dubai to recuperate and celebrated his birthday there with wife Coleen last weekend while United were winning 2-1 at Stoke.
Ferguson has no plans to rush Rooney back and he believes a longer than expected period of rest is the best cure for the England striker.
“There is no recovery, it is just rest,” Ferguson said. “Before he went away we did his remedial in terms of what we could do at the time. Thereafter, rest - we’re quite happy with that.”
Rooney’s prolonged absence puts pressure on Bulgarian forward Dimitar Berbatov and young Mexican striker Javier Hernandez to lead United’s attack until he returns to fitness.
Ferguson’s team, who host Tottenham on Saturday, are currently five points behind Premier League leaders Chelsea.
Pakistan eased to their victory target of 179 with 18 balls remaining in the series decider
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