Boss Tony Mowbray told the club website: "The initial diagnosis from the hospital was that there's no break.
"But our medical staff want to do further investigations and he may have damaged ankle ligaments."
The Teesville-born striker made his debut for the club in a 2-1 defeat at Barnsley in December 2009, and has since made 11 appearances for the Teessiders.
Source: BBC Sport
Source: BBC Sport