Kasami is currently out on loan at Swiss side FC Luzern.
"We have got our people there and we get in touch with him every day," Jol told fulhamfc.com. "He is in a struggling team, fighting for relegation, and they have changed their manager. He is a young player, but for me it was important that we got an agreement with the club for him to play every week and he is doing that, so he will develop.
"Sometimes these loan spells are good. For example, Ka?a [Alexander Ka?anikli?] was very happy at Burnley and has come back even fitter than before after playing all these games. The players have to show that they are able to play in the Barclays Premier League."