The Metropolitan Police have revealed that an investigation has been launched into an incident which saw a steward injured during Chelsea's 3-2 defeat by Manchester United at Stamford Bridge.
Javier Hernandez appeared to be pelted by objects thrown from the crowd as he celebrated scoring
in front of Chelsea fans.
After that, a steward was treated before being taken to hospital.
Chelsea confirmed on Sunday they would investigate the incident.
"We are investigating all the incidents around that time," said a Chelsea spokesman.
"We are looking at reports of objects that may have been thrown or incidents around the steward taking a fall.
"My information so far is that he slipped and fell, may have hurt his knee, and was being treated by the side of the pitch."