Saief began his professional career with
Bnei Sakhnin in 2011, before he was transferred to
Hapoel Haifa one season later. The next year, he moved to
Hapoel Ironi Kiryat Shmona and reached the final of the
Israel State Cup. Saief made only two appearances however, which resulted in a transfer to
Ironi Nir Ramat HaSharon. There he gained more playing opportunities. Saief attracted the attention of Belgian Pro League team K.A.A. Gent, who signed him for a three-year deal on August 8, 2014. Saief's first season at the club saw him with the
Belgian Pro League title. After four seasons at Gent, Saief officially signed to
Anderlecht in May 2018. On March 6, 2019, Saief was loaned to
FC Cincinnati of
Major League Soccer. On March 24, 2019, Saief scored his first MLS goal against the
New England Revolution. On June 11, 2019, Saief's loan was terminated due to injury complications. On February 12, 2020, he was loaned to Polish Ekstraklasa's
Lechia Gdańsk until the end of 2019–20 season. On 1 July 2022, Saief signed a two-year contract with
Azerbaijan Premier League club
Neftçi. On 14 December 2023, Saief left Neftçi. On 19 December 2023 signed for
Maccabi Haifa. == International career ==