Atlanta United went on to lose 2-0, snapping its eight-game unbeaten streak.
Atlanta United captain Michael Parkhurst said he didn’t understand the ruling.
Martinez, who declined to speak after the game, has been involved in several offside controversies this season. A goal in the home game against Montreal was taken off the board because Martinez, standing offside, was ruled to have interfered with the goalkeeper.
The disallowed goal wasn’t the only controversy in the game.
Atlanta United goalkeeper Brad Guzan was given a red card in the 34th minute after tackling Khiry Shelton just outside the penalty box.
Neither Parkhurst nor Guzan disagreed with the decision. Leandro Gonzalez Pirez said it was a foul, but didn’t agree with the red card because he said he was running back to cover the goal. That argument implies that Guzan didn’t deny a clear goal-scoring opportunity.