He said: "The season is not finished yet. Wayne showed his real form towards the end of last season and scored some important goals for us. So he's well capable of getting more than 20 goals.
"All strikers, particularly younger ones, start to wonder where their next goal is coming from when they are not scoring.
"And when they are, they don't think it's ever going to end. Wayne's no different. All a striker needs is that confidence factor to score.
"I'm sure Wayne will get that and score plenty more goals this season."