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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.