Mesut Ozil has given Arsenal a boost by starting in their Premier League match at home to Chelsea.
Ozil had been a major doubt for the game due to an ankle injury, but lines up along with Alexis Sanchez for a game that could be crucial to the Gunners' top four hopes.
Arsene Wenger has opted for a back three of Rob Holding, Shkodran Mustafi and Calum Chambers, while Jack Wilshere starts again in midfield.
Eden Hazard returns for Chelsea, who also go for a back three at the Emirates.
Hazard replaces the in-form Willian who excelled in the 5-0 win over Stoke. Alvaro Morata keeps his place despite struggling in the Stoke game.
[Arsenal v Chelsea: LIVE updates]
ARSENAL: Cech, Holding, Mustafi, Chambers, Bellerin, Xhaka, Wilshere, Maitland-Niles, Ozil, Sanchez, Lacazette... Subs: Ospina, Mertesacker, Coquelin, Elneny, Walcott, Iwobi, Welbeck.
CHELSEA: Courtois, Azpilicueta, Christensen, Cahill, Moses, Kante, Bakayoko, Fabregas, Alonso, Hazard, Morata... Subs: Caballero, Rudiger, Zappacosta, Drinkwater, Willian, Pedro, Batshuayi.