Toronto, Jun 24 : Bollywood superstar Shahrukh Khan is doubtful to perform during the Floriana Indian International Film Awards (IIFA) function to be held here tomorrow due to his fractured left knee."It would be hard for me to perform with a fractured knee but hopefully, I will try to entertain the people of Toronto on the stage," the Bollywood heart throb told mediapersons after he was given a