It is believed the La Liga side’s deal for the 23-year-old does not include an option to buy, per respected football journalist Paul Joyce.
Sandro joined Everton from Malaga for £5.2m last summer and was regarded as a bit of a coup by Ronald Koeman and Steve Walsh at the time since he was being actively pursued by a number of clubs.
Unfortunately the former Spain U21 international and Barcelona youth product failed to settle, scoring just once in 16 appearances in all competitions.
Sandro spent the second half of last season on loan at Sevilla before returning to Merseyside in the summer. The former Barcelona man regularly featured in the preseason and there were no doubts about his attitude and work rate. Sadly, he just didn’t seem to have enough quality to succeed in the English game.
His move back to La Liga is yet another damning indictment of last year’s transfer splurge by Koeman and Walsh. Sandro is the fifth player signed last summer to leave the club either on loan or permanently within 12 months following Wayne Rooney, Davy Klaassen, Nicola Vlasic and Cuco Martina.