The summer arrival from Lille has battled for form so far this season.
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"David is in good shape. He is very professional, and can move no matter where he is on the pitch," said Spalletti.
Spalletti believes that it is self-confidence that is lacking for David at the moment.
"It's a shame he doesn't have enough confidence to show his qualities right now, but he can be a top-class finisher. He has what it takes to be an incredible goalscorer," he added.
The striker's contract with Juventus extends until the summer of 2030.