Didier Drogba was taken to hospital after suffering a sickening head injury in Chelsea's 3-1 Barclays Premier League win over 10-man Norwich.
The striker was knocked out in a collision with Canaries goalkeeper John Ruddy and was carried off on a stretcher wearing what appeared to be a breathing aid after receiving seven minutes' treatment at Stamford Bridge.
"We are just waiting for the full exams on his concussion and hopefully nothing is wrong," said manager Andre Villas-Boas. "He is showing some good signs of recovery for us to be a little bit more tranquil."
Villas-Boas had no problem with Ruddy's challenge but said of the incident: "It looked pretty nasty. He lost consciousness completely on the pitch. I have to be very, very grateful, not only to my players but to the Norwich players and to my medical staff for reacting so quickly to a potentially dangerous situation."
Drogba's injury scare was just one of several dramas in the game, which was ultimately decided by a controversial penalty.
Its award with 10 minutes remaining sparked a major flashpoint between the benches, with Norwich boss Paul Lambert shoving Chelsea coach Jose Mario Rocha after the latter entered the visitors' technical area to celebrate the spot-kick.
Describing Rocha as "the guy with the stopwatch on his neck", Lambert said: "I don't know who he is but he's flown right into our area. I'm not fluent in Portuguese so if he understands Glaswegian then he might know what I said. You don't do that - it's disrespectful."
Chelsea boss Andre Villas-Boas hit back, saying: "I know Paul was excited, not only with that. It's difficult to control your own emotions on the bench. But I would find it very, very strange if my technical staff would be disrespectful of Norwich and maybe they were just showing some emotions. If Paul can't handle that, I'm sorry - unlucky."
Lambert also took issue with the penalty award, which came after Ruddy brought down Ramires and was sent off, allowing Frank Lampard to add to Jose Bosingwa's first-half strike before substitute Juan Mata added a debut goal in stoppage time. Norwich had levelled when Grant Holt capitalised on a horrible error from Blues goalkeeper Hilario.
Branding referee Mike Jones' decision for the spot-kick "harsh", Lambert added of Ramires: "I think he's lost control of the ball. He's actually going to ground before he's got it. But the referee's only got one take on it."
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