Chelsea have confirmed that David Luiz has joined Arsenal on a permanent transfer.
The Brazilian defender joins on a two-year deal for a fee believed to be in the region of £8m.
He will wear jersey number 23.
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“We thank David for his service and wish him well in his future career,” Chelsea said in a statement on their official website.
Luiz, 32, joins the Gunners following Arsenal’s £25m deadline day purchase of Celtic left-back Kieran Tierney, 22.
Arsenal manager Unai Emery said Luiz brings “huge experience” and “adds to our defensive strength”.
Luiz takes Emery’s summer spending over £130m after deals for Nicolas Pepe, William Saliba and Gabriel Martinelli.