Arsenal are being questioned for the first time this season after losing to title rivals Manchester City.
The Gunners have slipped to second, although they can return to the summit should they win their game in hand. Defeat at the Emirates was their third game without a win, however, as Mikel Arteta is called upon to rally his troops.
Their reverse on Wednesday night means the north Londoners, who have the youngest squad in the league, must prove they have the appetite for the fight as City eye a third straight title. Kevin De Bruyne was targeted by objects as he wandered off the pitch, which has resulted in a Football Association investigation.
