Kamara started his career with FC Kallon and joined Bodens BK, competing in Division 1 Norra, on 29 July 2011.

After the season Örebro SK decided to buy him from AIK, where he struggled to make an impact after failing to score in fourteen league appearances.

[5] On 2 June 2012 he made his senior international debut for Sierra Leone in a 2014 FIFA World Cup qualification game against Cape Verde.

[6] On 2 September 2018, Greek Super League club Panetolikos officially announced the signing of Sierra Leonean international Alhassan Kamara Crespo until the end of 2019-20 season.

[7] After a spell with IFK Värnamo, Kamara announced his retirement from football on 23 September 2021 after several years of problems with a knee injury.