Port have signed three more players, the Thai League 1 club said yesterday.
The three are Brazilians Guilherme Ferreira Pinto and Airton Tirabassi and Thailand defender Suphanan Bureerat.
They will join fellow new signings, Brazil's Hamilton Soares and Iraq's Frans Putros, at Port.
"We are trying to make the team stronger. We know that the upcoming Thai League 1 season will be very competitive as several teams have made interesting signings of new players," Port chairwoman Nualphan Lamsam said.
"I think fans already know Brazilian defender Airton and Safe [Suphanan]. I believe that their potential and experience will help make us stronger."
Airton played for Thai League 1 side Nongbua Pitchaya last season, while Suphanan was recently called up to the national side.
Nualphan said although Pinto, 30, has never played in Thailand, he has played in South Korea.
The forward, also known as Negueba, played for South Korea's Incheon United last year.
He was a member of the Brazil team which won the U20 World Cup in 2011, along with Casemiro, Philippe Coutinho, Oscar, Wilian and Alex Sandro.
"He will give us more options in attack. I hope the new players will settle into the team quickly," Nualphan said.
Striker Soares, 31, was the top scorer in Thai League 1 last season after netting 19 goals for Nongbua Pitchaya.
Port finished eighth in Thai League 1 last season, 23 points behind champions Buriram Untied.
Nualphan has also brought in new coach in Englishman Scott Cooper for the new season, which begins next month.
Nualphan is also manager of the Thai men's senior and U23 national sides.
Some Port fans have called on her to quit the job to focus solely on the club.
Pathum signs Phitiwat
BG Pathum United have completed the signing of Thailand international Phitiwat Sukjitthammakul from Chiang Rai United, the Thai League 1 club announced yesterday.
The midfielder helped Chiang Rai win one Thai League 1 title, three FA Cup trophies and one League Cup crown during his five seasons with the Beetles.
Phitiwat was also named the 2019 Thai League 1 Player of the Year.
BG finished second in the league last season.