The Chelsea employee had to be treated by paramedics after going to ground in the immediate aftermath of Chicharito's controversial late goal on Sunday.
The steward, who was positioned in the Matthew Harding stand, was treated for 10 minutes by paramedics after going to ground following Chicharito's winning goal 75 minutes into the game. Police have now revealed that they will be looking into the incident in conjunction with the West London club.
"My understanding is that there is a steward with an injury and it's not yet clear what caused that injury but we will look into it with the club. There should be CCTV," Commissioner Bernard Hogan said.
"Obviously, there was some dispute at the end of the game, given it had been quite a controversial game. What we have to find out is if there was just one person involved or if there were any more. We will review the footage and talk to the clubs."
A spokeswoman for the police also added: "We are aware of an incident during yesterday's match at Stamford Bridge in which a steward was injured. An investigation has been launched into the incident and our inquiries continue."
Despite insisting that the cause of the steward's injury is unclear, a Chelsea spokesman has revealed that reports of objects being thrown from the crowd are being looked into.
"We are looking at reports of objects that may have been thrown or incidents around the steward taking a fall," he said. "We are investigating all the incidents around that time. 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. He's been taken to hospital."