Undav's loan with Stuttgart has seen him set to be selected by Germany for the Euros.
Stuttgart's purchase option is between 13-15m.
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"The faster this is possible, the happier I would be, but it is a slow process," said Undav to local reporters. "I cannot decide this myself, because there are also other parties you have to talk to.
"We will see what happens. I try not to put any pressure on myself and am relaxed. If it's fast, it's fast, and if it takes longer, that's just the way it is. You can only hope that it will turn out the way you want."