David Moyes was convinced West Ham's stoppage-time winner that secured a 1-0 win over Sunderland should not have stood.
Winston Reid snatched victory for the hosts with the last kick of the match, a shot from the edge of the box through a crowd of players.
But Black Cats boss Moyes felt Hammers substitute Jonathan Calleri was in an offside position -- and in goalkeeper Jordan Pickford's line of sight -- as the ball flew past.
However, referee Bobby Madley gave the goal and rock-bottom Sunderland were consigned to a seventh defeat from nine matches this season.