Alexis Sanchez is still acclimatising to life in England, and be yet to adjust to the weather.
The former Barcelona star was the only outfield Arsenal player wearing the unusual attire of tracksuit bottoms instead of shorts, in training at London Colney yesterday.
No official reason was given for Sanchez's choice of wear, but the player renowned for his short shorts at the World Cup could still be adjusting to the English weather, with Monday a breezy 16 degrees in London.
There will be far worse weather to come for the Chilean international as the year progresses, who impressed at the weekend against Crystal Palace, providing five goalscoring opportunities.
Sanchez has flown out to Turkey as part of Arsenal squad and hopes to be selected to start the club's Champions League qualifier first leg against Besiktas on Tuesday night.