Arsenal defender David Luiz has agreed a new one-year contract with the club.
Defenders Pablo Mari and Cedric Soares will also join the Gunners permanently at the end of their loan deals, from Flamengo and Southampton respectively.
Meanwhile, midfielder Dani Ceballos has extended his loan deal from Real Madrid until the end of this season.
"I am really happy that we will have these players in our squad for the future," said the Premier League club's technical director Edu.
"They have been part of the long-term technical plan [manager] Mikel [Arteta] and I have developed. They bring the right balance to our squad."
Brazil centre-back Luiz, 33, joined the club from Chelsea last year but was sent off during Arsenal's return to Premier League action, a 3-0 defeat at Manchester City, last week.
"David is a really important player for us. He has played most of our matches this season and has been important for the team," added Edu.
"His passing, his communication with the team on and off the pitch - he helps everyone."
Spanish centre-back Mari, 26, and Portugal right-back Soares, 28, will complete their moves when the transfer window opens next month.
Latest Stories
-
GRIDCo to receive 100MW power supply from IPPs in coming days
5 mins -
How technology is weaving African markets into the global fabric
9 mins -
Dr. Ekua Ekumah highlights how to cultivate new theatre audience
19 mins -
Zambian FA president charged with money laundering
37 mins -
Mysstel releases video for ‘Paradise’
40 mins -
We are yet to receive an apology from Ashanti Regional Minister – ECG
43 mins -
UEFA International Tournament: Ernest Ofori scores for Black Starlets in defeat to Russia
49 mins -
Cocoa price surge linked to production decline – COCOBOD CEO
55 mins -
Atarah Praise returns on May 19 at Adenta Barrier
55 mins -
World Robotics Championship: 18 pre-tertiary students poised to win medals for Ghana at global competition
60 mins -
Drowned widow was scammed out of $1.5m on dating app hoax, left note about secret ‘double life’
1 hour -
ECG workers threaten to disconnect power from Ashanti Regional Minister’s home
1 hour -
Brain tumour shatters 20-year-old’s dream of becoming a doctor
2 hours -
ICDP Ghana introduces portable ultrasound machines in rural communities
2 hours -
Seven killed in sleep after Ethiopia building collapses
2 hours