Leading 1-0 thanks to Nicolas Pépé's 32nd-minute goal on Tuesday, Arsenal started its implosion when Luiz was given a straight red card.
Mikel Arteta praised David Luiz and said he is one of the leaders at Arsenal who is working hard to become better.
With this draw, Arsenal's three-match Premier League winning run came to an end.
Raul Jimenez was wheeled off the field wearing an oxygen mask, but Luiz played on with a bandaged head until halftime.
The 29-year-old Jimenez was taken away on a stretcher in the fifth minute and then to a hospital, after a collision with Arsenal defender David Luiz while both challenged for a corner from Willian.
Arsenal are languishing in 10th after a second consecutive league loss following their 1-0 defeat at Manchester City last weekend.
Conte left out David Luiz, Antonio Rudiger, Victor Moses and Alvaro Morata for Tuesday's 6-0 thumping of Qarabag.
David Luiz cautioned against Chelsea fans getting carried away with a run of three straight wins, all without conceding a goal.