The Blues defender was unhappy with the way his side conceded the opening goal at Wembley as they lost the cup to their London rivals
Alexis Sanchez benefitted from the "crazy" offside rule to score the opening goal in Arsenal's FA Cup final win over Chelsea, according to Gary Cahill, who said it should have been disallowed for a handball.
The Chilean latched on to a bouncing ball which struck his hand before he slotted past Thibaut Courtois. Aaron Ramsey was in an offside position but the referee and linesman judged him to not be interfering with play.