The Belgian hasn't put a foot wrong since his arrival from Ajax last summer.
"You probably wouldnâ€™t expect me to say anything else, but Janâ€™s been nothing short of fantastic, an unbelievable player," Parker told the Spurs website.
"He shows great composure on the ball, works hard, is an athlete and youâ€™ve seen the goals heâ€™s scored as well.
"He's been massive for us this season and you can only see him getting stronger and stronger.
"Technically, he's a very gifted footballer. Heâ€™s like a Rolls Royce, he glides around the pitch so effortlessly, he can step out with the ball and heâ€™s nicked a few goals as well. Thatâ€™s invaluable."