The Dutch striker has struggled for form at Tottenham since his summer arrival from AZ Alkmaar.
But Monkou told Ziggo Sport: "Of course Jansson can make it in the Premier League.
"He's physically strong, brimming with energy and has a fantastic left foot. And the most important thing is perhaps that his coach Mauricio Pochettino has expressed confidence in him."
He added: "You need six months if you are moving to the Premier League. Let us not forget that even Dennis Bergkamp after his switch from Internazionale to Arsenal had it difficult."