Arsenal boss Arsene Wenger fears Manchester City could have the title wrapped up by Christmas.
Some bookies have made them favourites to win the league and Wenger admits they are setting a pace which will be tough to match.
Wenger said: "If they are still there with that difference in December, then you can say it will be difficult to catch them.
"No team has no vulnerability in our League or any other League. They have quality. They can score goals, they can be efficient. They are the ones to catch.
"They had some impressive away results, especially at Tottenham and Man United but we have to see. The potential is there but we will see on a longer period."