Match points: Chelsea v Arsenal

John Terry.
John Terry.PHOTO: ACTION IMAGES
Theo Walcott.
Theo Walcott.PHOTO: EUROPEAN PRESSPHOTO AGENCY
Nemanja Matic.
Nemanja Matic.PHOTO: EUROPEAN PRESSPHOTO AGENCY
Mesut Oezil.
Mesut Oezil.PHOTO: AGENCE FRANCE-PRESSE
Diego Costa.
Diego Costa.PHOTO: AGENCE FRANCE-PRESSE
Laurent Koscielny.
Laurent Koscielny.PHOTO: AGENCE FRANCE-PRESSE

 Key battles

John Terry v Theo Walcott

Olivier Giroud's sending-off in Zagreb is another reason for Wenger to start with Walcott. He has scored in his last two games, even if his finishing can be mixed, and his pace in the channels is something Arsenal could hope to exploit. Terry has never played with Baba Rahman so there may be space between centre-back and left-back.

Nemanja Matic v Mesut Oezil

Matic's major contribution this season was his superb strike in last week's 3-1 defeat by Everton. He has not protected the defence well enough and Chelsea have struggled against elusive attacking midfielders. That could afford an opportunity to Oezil, who is still to convince doubters that he delivers enough in the biggest games.

Diego Costa v Laurent Koscielny

Costa's brilliant volleyed goal against Maccabi was out of keeping with his bad-tempered but ineffectual displays this season. He has only one league goal, compared to seven at this stage last season. The athletic Koscielny is Arsenal's best defender. The question is whether he will be paired with Per Mertesacker or Gabriel Paulista.

A version of this article appeared in the print edition of The Straits Times on September 19, 2015, with the headline 'Match points: Chelsea v Arsenal'. Print Edition | Subscribe