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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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?