David Luiz has signed a new one-year contract at Arsenal, while Pablo Mari and Cedric Soares have made their loan moves permanent from Flamengo and Southampton respectively.
Dani Ceballos has also extended his loan from Real Madrid until the end of the season.
Luiz was due to be out of contract at the end of June and Arsenal head coach Mikel Arteta had urged the club to extend his deal.
