Mikel Arteta warned his Arsenal players they must improve their set-piece defending "dramatically" after they were held to an entertaining stalemate by Sporting Lisbon.
William Saliba opened the scoring with a brilliant header on 22 minutes but Goncalo Inacio and Paulinho struck either side of half-time to turn the Europa League last-16 tie on its head. Sporting had chances to extend their lead but a Hidemasa Morita own-goal from Granit Xhaka's cross just after the hour mark levelled the scores, leaving the tie finely poised ahead of next Thursday's second leg.
Matt Turner had a game to forget in the Arsenal goal; his indecision allowed Inacio a free header from a corner and his poor parry gave Paulinho a simple tap-in to put Sporting ahead for the first time.
