Chelsea are to investigate after Aston Villa, who beat the Blues 2-1 at Stamford Bridge on Saturday, reported that a bottle was thrown at their substitutes bench as emotions ran high.
The incident took place just after the final whistle was blown on a game that reached a dramatic conclusion with Villa coming from behind to stun Enzo Maresca's side.
Chelsea will investigate the complaint having been told that a plastic water bottle was launched at the Villa bench, showering players and staff.
Photos clearly captured the moment the bottle flew through the air and sprayed the Villa replacements.