Spurs can be caught - Cahill
Defender Gary Cahill remains convinced Chelsea can pile on the problems for London rivals Tottenham this weekend.
Fifth-placed Chelsea trail Spurs by five points with nine games remaining following Wednesday's loss to Manchester City but Harry Redknapp's once high-flying men are winless in four matches ahead of their trip to Stamford Bridge on Saturday.
Cahill said: "Arsenal are having decent form and Spurs have been hit the last few games. It is hard to keep that momentum going throughout the season. Spurs have been absolutely fantastic but it is tough to keep it going every single game week in, week out. You'll always have a blip in the season and maybe theirs has come now."
Spurs have a notoriously poor record at Chelsea having not won at the home of the west London club since 1990.
Cahill added: "We're at home, where we have some confidence now and we are looking to get the positive result we need. We have built some momentum of late and the camp is positive at the minute."
Meanwhile, Chelsea received a huge boost on Thursday afternoon with the news that John Terry looks set to be fit for the derby clash.
Terry missed out against Manchester City due to calf cramps and has not been able to train fully since last week's win over Napoli, which was only his second appearance since returning from knee surgery.
The 31-year-old looks as if he will be able to face Tottenham, however, after taking part in a training session.
Branislav Ivanovic, who came off after 21 minutes against City with a thigh injury, will be assessed over the next 24 hours to see if he is fit to play on Saturday.