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John Terry will miss Chelsea's Premier League tie against Chelsea because of an ankle injury.
Terry was injured in the latter stages of Chelsea's 2-2 draw with Swansea and subsequently missed the loss to Liverpool last weekend.
He was initially ruled out for up to ten days but the captain failed to recover and will sit out the trip to Emirates Stadium on Saturday.
"John hasn't recovered from his injury," manager Antonio Conte told his pre-match press conference.
"He's working, working, but he hasn't recovered for the game against Arsenal. I don't know (when he will be back). In this case it's important what the player feels, the pain he feels.
"In the team and the squad we have three central defenders. It's normal to make a choice. It's normal when you are in a team like Chelsea to have this problem, but I don't see any problem in this situation."
Chelsea suffered their first defeat of the season last week when they were beaten 2-1 by Liverpool at Stamford Bridge and they will be looking to bounce back against Arsenal.
"This is a big game between two big rivals. It's important to play a good game. Above all after our defeat against Liverpool. But we know that we'll face a team, a good team, a big rival," Conte said.
"I'm sure that Arsenal will fight until the end to win the title because they're a very good team, (with) young players, great technique, good players with good physical potential and organisation.
"When there are these types of games, they're very tough. It's not necessary to push any player. These big games give great emotion and great expectation. For this reason the players are already motivated.
"(Chelsea) can improve a lot. It's normal that, when you start work with a new team, and you bring a new idea or method of football, you need a bit of time. But I'm confident about this. We trust in the work. I know that we can improve a lot."
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