Chelsea boss Andre Villas-Boas admitted his side may struggle to challenge for the title after drawing against Fulham at Stamford Bridge.
Juan Mata's strike early in the second period put the Blues on course for victory in the west London derby, but Clint Dempsey's equaliser against the run of play earned the Cottagers a share of the spoils.
The Blues remain 11 points behind Manchester City after they drew against West Bromwich Albion, but 'AVB' knows his side will need to show more attacking threat if they are to close the gap in the race for the Premier League.
"Fulham were very organised with no spaces between the lines. It was difficult and we couldn't create enough penetration to give us the opportunities. We lost a bit of momentum after we scored the goal and they scored from a good chance," Villas-Boas told the official Chelsea website.
"We tried a lot and had good opportunities but we always collided with a brave Fulham defence and David Stockdale who had a fantastic game in goal, we couldn't get the second goal which would have given us the three points.
"The title will be pretty difficult now. The distance by the end of today could make it very hard for us to challenge for the title. It would have been a good December for us if we'd finished with six points from two home games, but taking this draw into account it makes it difficult now.
"There is no big drama in how we change our perspective but you have to be realistic. Unexpectedly we reduced the gap to seven points a few weeks ago but with Manchester City continuing to pick up points, as well as Manchester United, it makes it difficult."