Undav is on-loan at VfB Stttgart, where his form this season has seen him break into the Germany squad.
"Deniz Undav is coming back," The Athletic quotes De Zerbi as saying today.
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For his part, Undav has made it clear he wants to remain with VfB and preferably as a permanent transfer.
However, his purchase option of 40m is out of reach of the Bundesliga club.