Full-backs Reece James and Ben Chilwell both start today's away game in north London.
James missed the previous game, the win against West Ham, with a knee problem and Chilwell was forced off during it after turning his ankle but both have recovered sufficiently to take their places, which means Cesar Azpilicueta returns to the bench and Thiago Silva takes the captain's armband.
With Mateo Kovacic coming into midfield in place of Jorginho, there are two changes from the West Ham game.
For Arsenal, neither David Luiz nor Willian are involved against their former club.
Chelsea Mendy; James, Zouma, Thiago Silva (c), Chilwell; Kovacic, Kante, Mount; Pulisic, Abraham, Werner.
Subs Kepa, Azpilicueta, Rudiger, Emerson, Jorginho, Gilmour, Havertz, Hudson-Odoi, Giroud.
Arsenal Leno; Bellerin (c), Holding, Mari, Tierney; Elneny, Xhaka; Saka, Smith Rowe, Martinelli, Lacazette.
Subs Runarsson, Ceballos, Soares, Mustafi, Maitland-Niles, Pepe, Willock, Nketiah, Aubameyang.
The referee is Michael Oliver.
Stats recap
Chelsea play Arsenal for the 202nd occasion in all competitions, more than we have played against any other club.The Blues are going for back-to-back away league wins at Arsenal for the first time since November 2009.Arsenal have won two of their past 17 Premier League meetings with Chelsea (with six draws, nine defeats), both at the Emirates – 3-0 in September 2016 and 2-0 in January 2019.
Having gone five away league games since the start of the season without defeat including three wins, Chelsea are now hoping to avoid three consecutive away defeats in the Premier League since Jan/Feb 2019 when we lost to Arsenal (0-2), Bournemouth (0-4) and Man City (0-6).Chelsea are the Premier League’s second highest scorers with 29 goals, seven fewer than Liverpool and only Man City (12) and Aston Villa (13) have conceded fewer league goals than the Blues (14).Frank Lampard’s side have scored more goals from corners than any other team in the Premier League this season (eight).Tammy Abraham has scored 25 goals for the Blues since the start of last season, seven more than any other Chelsea player.