The 19-year-old forward has already started training with Brendan Rodgers’s team.
Henderson, who himself is very young and is only 20 years of age, has been impressed with what he has seen of France Under-20 international so far.
LH: Very impressive. Strong on the ball and a great finisher. https://t.co/YupiFwkFgV— Celtic Football Club (@celticfc) July 2, 2016
Dembele is hugely talented and very promising, and he should prove to be a great signing for Celtic.
The France Under-20 international forward scored 14 goals and created 42 chances in 42 Championship appearances for Fulham last season.
During the 2014-15 campaign, the teenager created three chances in 11 matches for the Cottagers.
Henderson himself is a very talented young midfielder, and he will be aiming to impress new Celtic manager Rodgers in pre-season training.
The Scotland Under-21 international played on loan for Hibernian in the Scottish Championship during the 2015-16 season.