The 34 year old striker has the option to remain in Germany for at least another 12 months, but has previously admitted to being tempted by the prospect of a Premier League challenge.
He told Jutarnji list: "As I have said before, Wolfsburg have offered me a new contract which is for one year and then another optional year. The money is great but I haven't made a decision yet.
"I have also got an offer from Stoke. I talked with the manager and president of that club and I saw that they really want me.
"So I will stay at Wolfsburg or I will move to Stoke. But at the moment I don't know which. Maybe there will be other offers. I'm calm at the moment and soon I will make a decision."
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