The 18-year-old spent large spells of the 2022/23 term with the Hammers’ first-team squad. He also made his senior debut under Moyes in November.
Mubama broke through just nine days after his 18th birthday as the Irons faced FCSB in the Europa Conference League. Moyes started the centre-forward away to the Romanian outfit with their progress secured. He also gave Mubama his Premier League debut in December.
The 2022/23 saw him make his top-flight debut away to Arsenal. Moyes introduced the striker for Michail Antonio on Boxing Day.
Mubama scored his first senior goal as West Ham edged AEK Larnaca at London Stadium in the Europa Conference League last 16. He also helped toward a goal on his senior debut at FCSB. Joyskim Dawa turned the ball into his own net to make it 2-0 from Mubama’s efforts.