The dark coloured kit is thought to be the away kit for the Hammers next season. The blurry image has since been spread on social media after former West Ham DJ Leon Hyde posted it online on twitter.
However, some supporters have suggested that the premature publication of kit is actually a clever PR stunt by the club to get more publicity for the third kit than it would normally get.
West Ham has yet to reveal details of the West Ham home or away kit for next season.