Marcus featured regularly for West Brom in the Under-18 Premier League and scored six goals for The Baggies in that competition. He also played for the Premier League team’s reserve side and in the Checkatrade Trophy.

Marcus has been a regular for Finland at youth international level.

The 18-year-old signed a two-year deal at Brentford after leaving West Bromwich Albion at the end of the 16/17 season.