The midfielder suffered ligament damage when he wrenched his knee in a tackle at Elland Road on Saturday.
Keane will have an X-ray today and could be out for weeks if the injury requires surgery. United have other worries for the match. Nicky Butt will play despite suffering a "dead-leg" while Ryan Giggs' troublesome hamstring means his fitness also is doubtful.
The Rangers defender Tony Vidmar is ruled out of tonight's Uefa Cup match against Strasbourg as he is needed by Australia, who play Tunisia in a friendly tomorrow. Rangers' other Australian,Craig Moore, is absent with a broken ankle while Brian Laudrup, who suffered a thigh injury on Saturday, has called on a Danish reflexologist to help speed up his recovery.Reuse content