Arsenal manager Arsene Wenger says it is too early to understand who will fight for the Premier League title this season.
According to the Frenchman, struggling Chelsea could be back in the race even if they are 15th in the table, 14 points off the top of the table.
"Mathematically you cannot rule them [Chelsea] out - even the bottom teams are in it," Wenger said.
"It is so difficult. It is so tight and I don't even look at the league anymore because it is very, very tight.
"Last week we had a bad result against West Brom and so did Manchester City [against Liverpool] so it compacted the whole table.
"I believe it is a big opportunity for us but many teams can tell you that. We are in a position where you want to be after 13 games but there are 25 to go.
"If there's five or six to go and we are in the race, of course [we are contenders]. I think we have a chance but it is very early. I know people always want to know what will happen in the future but let's take care of the game on Sunday."
Asked about new signings in January, he added: "We are in a position where we want to do something. If I find the right quality I will do something".
