The 31-year-old, who moved to Craven Cottage from Manchester United in the summer, has been a welcome addition to the London outfit but will be unable to boast Fulham's strikeforce against Manchester City this weekend.
"Unfortunately Dimitar is injured now and can't play on Saturday so that is the disappointing thing," said Jol. "He will be out for the next two weeks.
"In his session he was looking good, as usual, and then his final shot he felt something and he had to go in and stop training. It appears he had – not a tear – but a sort of problem with his hip and upper thigh so we couldn't take the risk to involve him against City."
The former Tottenham Hotspur boss also confirmed that Giorgos Karagounis should be involved tomorrow after recovering from a bout of injury.