Uche Nwofor is a major injury worry ahead of the home game with RKC Waalwijk on Friday, the official website of Heerenveen reported today.<br /><br />The Nigeria international had to be substituted in the 69th minute in Sunday&rsquo;s Eredivisie tie with FC Utrecht after suffering an ankle injury.<br /><br />Club physiotherapist Erik ten Voorde says Nwofor might be unavailable for selection as the game scheduled to hold at&nbsp; Abe Lenstra Stadion is coming too quick.<br /><br />22&nbsp; - year - old Uche Nwofor has had a difficult start to his Heerenveen career, having played only 49 minutes for the club in the Dutch championship.<br /><br />Heerenveen sit 10th on the table, 7 points behind table topping AZ.<br />