Manchester United boss
Sir Alex Ferguson is unsure how
long Rio Ferdinand will be out of action with a thigh injury.
The England international suffered a knock in training on
Friday, forcing him to miss United's season-opener against
Birmingham.
"Ferdinand pulled a muscle in training on Friday afternoon," he
told Sky Sports.
"He's out. I don't know how long he's going to be out.
"We're sending him for a scan on Monday."