Career
The Los Angeles Galaxy II currently competes in the USL Pro, the third tier of the United States soccer league system. Mainly a Left-Back and a player of great intelligence and strength, he can also operate as a centre back. Marseille
He had previously played for Olympique de Marseille, coming up through the youth ranks and making his first competitive start for the club in October 2009.
He featured in 4 first team friendly games.
Oldham Athletic
On 19 August 2011, he signed for Oldham Athletic on a five-month contract. On 20 August 2011, he made his Football League debut as a 90th-minute substitute coming on for Reuben Reid in a 2–0 victory
over rivals Rochdale.
After serving his suspension due to the red card against Huddersfield Diallo picked up a hamstring injury in the second match that he came back into the side and was out of action for two – and a – half months. After recovering from the injury the unlucky Diallo pulled up with a same injury in his first match back for the team, due to being rushed back into action too early.
He was taken off in the 14th minute in the Manchester Senior Cup Reserves match against Bolton, reports suggested.
R. White Star Bruxelles
After a successful trial with R. White Star Bruxelles Bradley Diallo signed a professional contract with the club in January 2013. Diallo signed an 18-month contract with the club with an option to extend. Bradley Diallo made his debut on 2 February 2013 against Sportkring Sint-Niklaas.
Los Angeles Galaxy II
Bradley joined the USL Pro team the Los Angeles Galaxy II ahead of their integral 2014 season.
Bradley made his league appearance debut for the Los Angeles Galaxy II on April 13, 2014 against fellow USL Pro side the Sacramento Republic Football Club.