Chelsea moved four points clear of United at the summit thanks to a 1-0 victory over Bolton.

Nicolas Anelka's first-half strike, his first in 14 games, settled the outcome and kept Chelsea on course for an historic League and FA Cup double.

Arsenal have the chance to close the gap against Tottenham in a London derby at White Hart Lane tonight but Cech warned the Gunners and United that one more mistake could be crucial to the destination of the trophy.

"Arsenal have a big game tonight against Spurs because they're the furthest away and if they don't win, the gap will open," declared Cech.

"They know they're under pressure. Then at the weekend there is the Manchester derby and we play a London derby at Tottenham. It can be a decisive week.

"It can change the position in the Premier League a lot if we manage to win our game and the others lose theirs. It could also go the other way and change everything for the last three games.

"But beating Bolton was a massive step forward. We can play good football and score goals but when a game isn't going our way and we have to fight and dig deep, we can do that. We showed it against Bolton.

"I have been at Chelsea for six years and just kept my first clean sheet at home against Bolton so now it's time for our record at White Hart Lane to change too.

"Last season everything went wrong. There was a bomb alert, the game was delayed, we were kept waiting and then we started slow and lost 1-0.

"Even though we had chances, it was not our day. This time it's going to be different for us."

Meanwhile captain John Terry admitted Chelsea were affected by a touch of the jitters against Wanderers.

Bolton had chances to snatch a draw and boss Owen Coyle was furious that referee Lee Probert rejected two penalty appeals.

"We were probably a bit slow in the tempo of our play and were taking too many touches," admitted Terry. "We were not at our best but fair play to Bolton, they came to win the game. They were pressing and staying man-to-man which made it difficult for us at times.

"Nerves with us not winning the Premier League for three years took their toll late on but we managed to hold on.

"We are getting closer week by week but it is just important that we keep winning. Man United, Arsenal and us have all got tough away games this weekend. We are just concentrating on ourselves and we have a little cushion now."

Coyle claimed that Bolton should have had a first-half penalty when Didier Drogba handled and another one in the second period when Terry appeared to commit the same offence.

But Terry said: "I don't know what it looked like on TV but it certainly felt like it came off my chest.

"Over 40 odd games you are going get some penalties and you are not going to get others. Late on it hit Zat Knight's hand as well so we could have had one and maybe they could have had one as well, but over the course of the season you get your rewards.

Bolton defender Knight insists they should be proud of their performance against Chelsea which has put them a confident mood ahead of their weekend trip to Stoke.

"We worked our socks off and put in a very good performance and made it very difficult for a very good Chelsea side," he said. "We stuck in there and gave a good account of ourselves.

"We created a number of chances and we were disappointed that we didn't get the decisions we deserved.

"At the moment it is in our hands; Stoke will be a tough game but we have the belief and now we have to get on with preparing for Saturday."