The 19-year-old returns to Spain for his third loan spell away from the Gunners to earn valuable experience, having never made a first-team appearance for the Premier League side
Arsenal's promising youngster, Wellington, has joined Ponferradina on a season-long loan.
The 19-year-old's move to the Segunda Division side will be his third temporary spell in Spain after featuring 16 times for Alcoyano in the same league last season - scoring three goals - and also playing for La Liga outfit Levante the year before.
A statement on the Gunners' official website read: "Everyone at Arsenal wishes Wellington the best of luck for the coming season at the Estadio El Toralin."
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The attacker has never made a first-team appearance for the north London side, having been loaned out on his arrival, but did represent them as a trialist in pre-season friendlies against AFC Wimbledon and Boreham Wood in 2010.
The Brazilian, who has also played for his country at youth level, joined the Premier League side from Fluminense in 2011 after playing 17 games, and scoring one goal, for the Rio-based club in the 2010-11 season.