Rated one of the biggest aerial threats and fastest players in the game, Saab was previously contracted through 2026.
Injury has disrupted his 2024 campaign, with a hamstring problem suffered in the Las Vegas season opener sidelining him for more than a month before he went down again with a shoulder issue.
But Saab has returned to the field in recent weeks and shown impressive form.
"The improvement Jason has shown over the last 18 months is significant," Seibold said.Â
"I believe he can now become an elite winger, a representative-class winger.
"It's within reach. He has always had the potential.
"We've seen 'Saaby' score some great tries since he has come into first grade, but the consistency in his game has grown."
Saab made his NRL debut for St George Illawarra in 2019 but has played 68 of his 75 NRL games for the Sea Eagles, who he joined in 2021. He has scored 53 tries.
Saab is now on the second-longest contract of any active Sea Eagle, trumped only by State of Origin second-rower Haumole Olakau'atu, who is tied to the club through 2031.
Saab's fellow outside backs Tolu Koula (2026), Reuben Garrick (2026) and Ben Trbojevic (2027) are also signed long-term.
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