"It's true he starts often because he is in a very good moment and it is difficult to think about leaving him out," said Klopp.
"He is always a naturally fit player. We talk a lot to the medical department and it is really rare that any issues with him. You don't hear that's he had a problem here or a problem there, that's a big thing.
"When you hear the name of a player twice from the medical department it is pretty clear he is not in the squad or on the bench. That's how it works these times. We and he have been lucky so far that there is nothing around him.
"I didn't make a number (goals target) for him before when we signed him. We knew we would get a very offensive-minded midfielder who is a lot of games a striker but also has the ability to make goals, to setup goals. So that what was the package we wanted, and that's cool."