Arsene Wenger says Arsenal were "unlucky with some decisions" after losing 2-1 to Chelsea at Stamford Bridge.
The Gunners boss believes Chelsea's penalty, given for Wojciech Szczesny's foul on Ramires, should not have been awarded. Frank Lampard converted the spot-kick to double the home side's lead after Juan Mata's early strike. Theo Walcott pulled one back for the Gunners in the second half.
The result leaves Arsenal sixth in the Premier League, six points adrift of North London rivals Tottenham who occupy the last Champions League qualification spot in fourth.