Dutch champions Ajax picked up the 21-year old- attacker for a small transfer fee after he was been unable to make the breakthrough at Fulham.
Hoesen, who was signed in 2009 from Fortuna Sittard and returned there on loan last year, scored for Ajax against PSV last weekend, his third goal for the club since his switch.
Jol told Dutch paper Algemeen Dagblad: "Of course I have seen the game against PSV. It's nice for the lad he scored.
"Danny was still too light for the first team. Therefore we let him gain experience at Fortuna.
"The Netherlands is an ideal country for him to develop. Less physical fights, less surviving. Danny really is a decent player. I hope he keeps getting chances at Ajax."