Sancho has twice previously played for BVB, where he enjoyed the best football of his career during the first spell.
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BVB coach Niko Kovac has avoided answering questions about Sancho odirectly, declaring he doesn't want to be "dragged into this game".
In contrast, Kehl commented: "Sancho is constantly at the centre of transfer rumors. I understand the interest, but we are thinking carefully within our limits.
"The conditions must be right. We will do something, but we are limited by certain options."
