Arsene Wenger ripped into his Arsenal flops on Tuesday night, saying there was 'no rational explanation' for their miserable performance in defeat at Swansea.
Arsenal led through Nacho Monreal but extended their winless away run to five games in all competitions after two goals from Sam Clucas and one from Jordan Ayew.
Wenger later blamed a lack of 'confidence' for the run, but was furious with their fundamental errors at the Liberty Stadium.
The Frenchman, who also paid tribute to Olivier Giroud ahead of his likely move to Chelsea, said: 'We made unusual massive mistakes.