Manchester City midfielder Fernando remains confident Chelsea will soon stumble in the Premier League.
Jose Mourinho's side have opened up an eight-point lead over the ailing champions because of their unbeaten start.
"We know that the English league is very competitive, with big teams," said the midfielder.
"Of course Chelsea is the team that is best placed and playing better, but we know that all teams within the league fluctuate greatly.
"We did not start well, we had some difficulties, but we know that at any time Chelsea will also go through these difficulties and then we have to work to stay as close as possible.
"Of course the rivalry is big, Chelsea will try to keep away and we just have to work."
