The Dutch forward is happy to bide his time before extending his stay with the Royal Blues, while he is aiming for a win this weekend when his side entertain Bayern Munich
The Dutch ace signed up for the German outfit in 2010 and has been a hit since, scoring 64 goals in just 87 appearances in all competitions.
Talks about extending his stay in Gelsenkirchen have been mooted in recent months, however, the former AC Milan striker is content to take his time.
"They [Schalke] haven't made an offer yet," he was quoted as saying by Spox. "We didn't speak about money at all, only about the sporting side of things.
"I haven't set a deadline for myself, because I want to see how it will go with the team. After that we can look further. To me it's only about the sporting aspect."
On Saturday Schalke host German giants Bayern Munich in the Bundesliga, and the striker is hoping to recover from a blocked nose in order to play and help his team to a win.
"I hope I can play against Bayern. It's about time that we beat them," he continued.
"It's not that I'm sick at the moment, only my nose is stuffed right now. We'll have to see how it goes from here. I also have some little pains from the match against Olympiakos on Tuesday."
Schalke currently sit in fourth place in the table after recording two wins and a draw.