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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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.