The 19-year-old’s move will be his third spell on loan in Spain.
The youngster has previously had spells with Alcoyano and Levante.
A statement on the Gunners’ official website reads: “Everyone at Arsenal wishes Wellington the best of luck for the coming season at the Estadio El Toralin.”
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.