The distraught Blues captain was due to undergo an MRI scan after leaving Stamford Bridge on crutches and with a brace on his right knee following Sunday's 1-1 Barclays Premier League draw with Liverpool.
Terry was left writhing in distress 10 minutes before half-time after Luis Suarez fell on his leg following an accidental collision between the pair.
Following almost five minutes' treatment, he was carried off on a stretcher with his head in his hands and was attended to by club medics before being allowed home.
Sunday's match was the 31-year-old's first domestic appearance since his four-match racism ban.
Manager Roberto Di Matteo said: "We have to wait until tomorrow for his MRI scan to understand the full extent.
"When a player reacts like that, it's a concern. He's in pain now. He'll go to hospital tomorrow for a scan.
"We hope it's not a serious injury, but we'll see."
Terry was consoled by Di Matteo before disappearing down the tunnel.
"I was concerned about his well-being," the Italian added.
"We just got him back into the team after the ban. It was great seeing him out there."