The Saudi Pro League giants have already made a cash offer for the Barca Atletic starlet.
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Transfer expert Fabrizio Romano is reporting: "Al Ittihad have sent formal bid to Barça for Unai Hernández worth €4/5m.
"Negotiations underway with more steps to follow for Barça B captain to join Saudi Pro League side.
"Deal on and advanced."
With Barca Atletic, Unai has worn the captain's armband this season.