Fulham boss Jol keeping door open for Grygera
Jol has not yet closed the door on the possibility of keeping such an experienced player - providing he can convince him that there are no lasting effects of the injury.
"He did well from the first match, which is very unusual [for a player new to English football]," the Dutchman told the Fulham Chronicle. "I was very happy with him.
"He can play left-back, right-back or centre-back, but it's not a minor injury. It isn't easy to come back to full fitness if you're that age."