Manchester United boss Sir Alex Ferguson fears his star striker Wayne Rooney may be forced out of Saturday's blockbuster with Chelsea because of an ankle injury. The 24-year old England international had to leave the pitch towards the end of Tuesday night's 2-1 Champions League quarter-final first leg loss to Bayern Munich at Allianz Arena after landing awkwardly in a tackle and Ferguson fears he may be out of the top of the table clash at Old Trafford.

"He has got a kick to the ankle, we will just have to wait and see tomorrow (Wednesday)," Ferguson told Sky Sports .

"Hopefully it's not too serious. He may be doubtful for Saturday but we don't know, it's too early to say."