Major League Soccer is conducting a 'thorough review' of an incident in which Houston Dynamo midfielder Colin Clark called a ball boy a 'faggot' during a game last weekend.

A television microphone captured Clark uttering the slur to the ball boy during a throw-in situation. Apparenty the player wasn't issued a new ball as quickly as he wanted during the opening minutes of a game on Friday (23 March) against the Seattle Sounders.

Houston went on to lose the game 2-0.