All eyes will be on Stamford Bridge for the London derby that kicks off at 12:45 p.m. GMT. Should Chelsea claim victory, they will move seven points ahead of the Gunners and surely end their hopes of lifting the Premier League title.
It will be Arsene Wenger's 1,000th game in charge of Arsenal, though, so we can expect his players to put in a good performance to ensure it's an occasion to remember for the Frenchman.
Bleacher Report spoke to Cahill after Chelsea's 2-0 Champions League win over Galatasaray in midweek. You can watch the video above.
Garry Hayes is Bleacher Report's lead Chelsea correspondent and will be following the club from a London base throughout the 2013-14 season. Follow him on Twitter here @garryhayes