Luiz joins the Gunners on a two-year contract, with the deal following Arsenal’s £25m deadline day purchase of Celtic left-back Kieran Tierney, 22.
The 32-year-old centre back has a wealth of experience and has made 524 club appearances in a career spanning 13 seasons.
He started his career with Vitoria in Brazil, before moving to Portugal where he played for Benfica. He also had two spells with Chelsea and spent two years in France with Paris Saint-Germain, where he played under Unai Emery. He has 56 international appearances for Brazil to his name.
Unai Emery said:
“David has huge experience and I look forward to working with him again. He is a well known player and adds to our defensive strength.”
David will wear the number 23 shirt.