"To be perfectly honest I'd expected to have scored more by this stage, but I'm still confident I can get the eight more goals the boss has mentioned," the Dutch striker told official publication LFC Magazine.
"I've had a few decent games without scoring and missed some opportunities, so I should have a bigger total.
"Of course I want to score lots but for me that is not the most important thing. Reaching the semi-finals and ensuring we finish in the top four are my current priorities."