Arsenal started off their 2015-16 Premier League season with a 0-2 defeat at the hands of West Ham at the Emirates Stadium on Sunday.
Arsenal keeper Petr Cech's error allowed midfielder Cheikhou Kouyate to put West Ham ahead in the 43rd minute, the BBC reports.
Forward player, Mauro Zarate scored his side's second goal, after being gifted the ball by the Gunners defence during the second half of the game.
Arsenal will now lock horns with Crystal Palace next Sunday.