In 2018, Saab was picked for the Australian Schoolboys rugby league team and represented Australia in London, United Kingdom Saab made his first grade debut in Round 19 of the 2019 NRL season for the St. George Illawarra Dragons against South Sydney, starting on the wing and scoring two tries in their 20–16 loss in the last minute due to a Campbell Graham try at ANZ Stadium.

[7][8] In August 2020, Sporting News reported that Saab had sought an early release from his contract due to the traveling distance between Wollongong and his home in Western Sydney.

[9] In September, there was speculation that Saab would be joining the Manly-Warringah Sea Eagles as a trade for St. George junior Reuben Garrick.

[11] On 26 November 2020, Saab was granted a release from his contract with St. George and shortly thereafter signed a three-year deal with Manly-Warringah.

[26] Saab played 19 matches for Manly in the 2023 NRL season and scored 14 tries as the club finished 12th on the table and missed the finals.

He scored a long range intercept try before halftime, but near the end of the game suffered a hamstring injury that would ultimately see him miss the next 5 weeks.

[29] In round 18 of the 2024 NRL season, Saab scored a hat-trick in Manly's 21-20 golden point extra-time victory over North Queensland.