The Brazilian midfielder, who starred last season on-loan with Strasbourg, has only managed a total of 48 minutes on the pitch so far this season.
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However, manager Enzo Maresca is adamant Santos features prominently in his plans this season.
Saudi Pro League team Al-Qadsiah had tabled an offer worth up to £59.5million for Santos, but the player wasn't keen on moving to the Middle East at this stage in his careeer, says the Daily Express.
West Ham also made a £45m bid for Santos, but Chelsea insisted the youngster was not for sale.