Sagna took a knock in Saturday's 6-1 win over Everton while Denilson (groin) and Fabregas (hamstring) will also be assessed on before the game although Gunners boss Arsene Wenger believes the Spaniard has a better than 50-50 chance of playing.
Midfielder Abou Diaby has recovered from a groin injury but England forward Theo Walcott is still out with a back complaint and defender Johan Djourou (knee) remains on the sidelines.
For Celtic, Glenn Loovens and Shaun Maloney are doubts as Tony Mowbray looks to build on a 3-1 win over Aberdeen at the weekend
