Arsene Wenger's side passed up the opportunity to take first place on St Stephen's Day – losing 4-0 at Southampton, for whom Shane Long scored twice.
Their manager says he's confident his squad is strong enough to sustain a title challenge.
Tottenham could go third with a win away to Watford.
Three points from their meeting with Swansea could see Crystal Palace crack the league's top four this afternoon.
Elsewhere, Everton play host to Stoke, West Brom face Newcastle, Norwich take on Aston Villa, and Southampton go to West Ham.
