It was announced last month that Casemiro would leave United at the end of this season as his contract runs down.
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The Brazil international is now weighing up offers that arriving from around the globe.
And ESPN says Al-Ittihad want to convince Casemiro about a move to the Saudi Pro League.
Al-Ittihad see the 34 year-old as replacement for former Liverpool midfielder Fabinho, with his contract also due to expire this summer.
Along with Al-Ittihad, Inter Milan have also expressed interest in Casemiro this week.