The Germany international has been heavily linked with a switch to America when his contract expires in the summer.
But the striker has claimed that he is very happy at Lazio.
“At the moment I feel good,” he told Sport 1. “I feel fit. We did well against Udinese on Sunday, and we’re still hoping to finish well in the League.
“Coming here to Italy was definitely the right choice for me – everything’s gone as well as I could have hoped.
“My future? That is still to be decided. The decision will be made with my family.
“The USA is interesting. My family will make the decision, but there is no hurry. We’ll see what happens after the World Cup.”
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