Mikel Arteta admitted Arsenal must become more ruthless in key moments after his side survived a tense finale to beat Brighton 2-1 and move back to the top of the Premier League.
Mohamed Salah was back in action for Liverpool as they beat Brighton 2-0 on Saturday, while Chelsea returned to winning ways with victory over Everton.
Arsenal will be without William Saliba and Gabriel Martinelli for Wednesday's Carabao Cup fourth-round clash against Brighton as Mikel Arteta's injury concerns continue to grow.
Saturday's Premier League action saw Manchester United continue their good form as both Chelsea and Liverpool suffered damaging defeats.
Newcastle United boss Eddie Howe has admitted his side's midfield "didn't function well" during their 2-1 defeat to Brighton at the Amex Stadium.
Chelsea's injury crisis deepened on Saturday as the Blues fell 3-1 at home to Brighton, with Trevoh Chalobah's red card adding to an already stretched squad.