Elsewhere, Melbourne City have signed Japanese attacker Takeshi Kanamori on a two-year deal ahead of their Asian Champions League Elite campaign.
The Bulls are in the ACL2 competition after winning last year's Australia Cup, while they will also be hoping to return to the ALM finals mix.
Striker Ji had a stint with Sunderland FC in the English Premier League and played in the Bundesliga, most notably at Augsburg.
The 34-year-old has made more than 100 K League appearances and scored 11 goals in 55 internationals between 2010 and 2019.
He was also part of the team that won a bronze medal at the 2012 London Olympics.
"I love Australia, it has a good lifestyle and good football with strong young players. This is a good last challenge for my career," said Ji, who has signed a one-year deal.
"I have played in Europe so I will bring my experience to help the young players in this team."
Kanamori joins ALM champions City from Japanese club Avispa Fukuoka, where he made 309 appearances and scored 40 goals across two stints in the J2 and J1 Leagues.
He won the Asian Champions League and the Japanese Super Cup with Kashima Antlers, while also having a stint at Sagan Tosu.
"I'll do my best, putting all the experience I've gained so far into this project, aiming to not only win the championship for the second time in a row, but also to win the ACL together," he said.
City will hope Kanamori can spark their attack in their title defence, especially after star winger Marco Tilio departed at season's end.
Sydney FC captain Rhyan Grant, meanwhile, has extended his contract until the end of the 2026-27 season.
13°C