Bula has also made six appearances for Fiji, most notably scoring four tries as part of a 48-24 victory over the Cook Islands in the 2025 Pacific Championships Bowl in Port Moresby.
The 24-year-old said he was delighted to have secured his future at Concord for the next four seasons.
“I’m really grateful for the opportunity to remain with the Tigers for the next four seasons,” Bula said.
“The culture and connection that we have as a group is special, and I’m excited to be part of what we’re building. I love being here and I’m looking forward to growing my game under Benji and helping bring the club success.”