Obertan has largely struggled since arriving at Newcastle from Manchester United, though Pardew believes that his problem is to do with self-belief.
"Gabby is a player that, on the training ground, you would pick every day," the Magpies boss is quoted as saying by the Northern Echo.
"It is about transferring that to a matchday. And when he does, like he has done recently, then he is a real force.
"We need to keep that self-belief in him. When he has the self-belief, he is getting older now, he is getting to that point where he has to deliver week in, week out. So for Gabby, it is a big period for him."
Pardew has admitted that his side is desperate for a win against the newly-promoted Foxes.