Kacaniklic hit with injury blow
The Sweden international, 21, came off early during the Cottagers' 1-0 pre-season friendly defeat at Werder Bremen on Sunday night and will be in a race against time to be fit for the season opener away at Sunderland on August 17.
"Hopefully it is not too bad but he may be out for a couple of weeks," Jol told reporters after the loss in Germany.
"That is not what you want from pre-season. Kaca has made a lot of big steps and progress with us."
"We will try to get someone up front," he said.
"We need a few more goals, since Clint (Dempsey) left we do not have enough goals in us, so we are working every day to get someone.
"We have some high-quality players in consideration and we would like another midfielder as well."