Jesse Derry, a teenage Chelsea attacker, was taken to hospital as a precaution after suffering a head injury in the 3-1 Premier League defeat to Nottingham Forest.
In the 45th minute of his Premier League debut on Monday, the 18-year-old collided with opponent Zach Abbott in the Forest penalty area.
He received oxygen on the field before being carried off on a stretcher during a lengthy pause.
In a statement, Chelsea stated that Derry is “conscious, talking, and undergoing precautionary checks”.
After the match, Chelsea caretaker manager Callum McFarlane told BBC Match of the Day: “All signs are positive at the moment, so we’re hopeful he’s in good condition, and from what we’ve heard, it’s positive.”
“Gutted for Jesse, I thought he did well in the game. He gave us a threat – a massive moment for him that has ended sadly.”
Derry, the son of former Leeds and Crystal Palace midfielder Shaun Derry, was making his first start for the club having made two appearances off the bench in the FA Cup this campaign.
The England Under-19 winger has scored 12 goals in 29 academy matches this season since joining from Crystal Palace last summer.
His clash of heads resulted in a penalty being awarded to Chelsea, however Cole Palmer’s spot-kick was saved by Forest keeper Matz Sels.
Derry was replaced by Liam Delap who came on as a concussion substitute.
