Career
Previously Koroma played for Swedish Superettan club Varbergs BoIS and the Sierra Leone national football team He plays both as a defensive midfielder and central defender. Koroma is commonly known by his nickname "Marcel", which is taken from former French football player Marcel Desailly.
Football Club Kallon
Koroma played for Sierra Leone National Premier League side Football Club Kallon until 2008.
He scored 13 goals in 83 caps during his four-year stay at the club District of Columbia United
American Major League Soccer club District of Columbia United signed Koroma in September 2008.
However, he was waived at the end of the season as District of Columbia United failed to buy out his transfer rights from Football Club Kallon. This was caused by the roster changes in Master of Library Science from 28 to 24 players which meant that Koroma was surplus to requirement since they wanted to use their funds to give development contracts to SuperDraft players for the 2009 Major League Soccer season.
Motala AIF
At the start of the 2009 season Koroma was brought in on loan by Swedish third tier club Motala AIF. Even though the club was relegated at the end of the season Koroma returned again for the first half of the following year where he vas voted best defender of all six fourth tier leagues.
Trelleborg
After his success at Motala he was signed by Allsvenskan club Trelleborgs FF in July 2010. During his time at the club Trelleborg suffered two consecutive relegations and found themselves in the third tier at the start of 2013. This caused Koroma to declare that he wanted to leave the club
Varbergs BoIS
In February 2013 Koroma was signed by Superettan club Varbergs BoIS.
Koroma represented Sierra Leone as part of the U-17, U-20 and U-23 National Teams, before making his senior team debut in 2007.
In July 2014, Leonean ex-captain Ibrahim Kargbo was among 15 players and officials suspended indefinitely, along with Koroma, Samuel Barlay and Christian Caulker over allegations of match-fixing relating to a Africa Cup of Nations qualifier in 2008 against South Africa which ended 0-0. Club
Football Club Kallon
Sierra Leonean FA Cup
Sierra Leone Champions 2006.
