Garnacho is on the transfer-list at United this summer and has attracted an approach from Cristiano Ronaldo's Al-Nassr, says The Sun.
However, Garnacho wishes to continue his career in Europe and has rejected the Al-Nassr option.
Napoli are working on a deal for the Argentina international with United.
Their president Aurelio de Laurentiis said last week: "We want him because he's at United. Get him out and he becomes twice the player.
"There's a fault at United that I can't explain."
Related:
Manchester United
Al Nassr FC
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🚨 Paul Pogba: “Cristiano Ronaldo in 2008… there is not one player who did what he did.”