American international Clint Dempsey limped off  in the 63rd minute of Blackburn’s 2-0 win over Fulham on Sunday, ESPN reports. Fulham manager Roy Hodgson said Dempsey would have a scan on Monday to determine the extent of the injury, but claimed “it might be a posterior cruciate knee ligament which would be very bad for us and he would be out for a while.” Dempsey has been in terrific form for the London side recently, pairing up with striker Bobby Zamora who has also been forced from the Cottagers line up with an injury . The versatile American, who can play both as a forward and in the midfield, is seen as a key contributor for the national team as they gear up for South Africa.