Manchester City goalkeeper Ederson has backed calls for concussion substitutions in football following the injuries to Wolves striker Raul Jimenez and Arsenal's David Luiz.
Jimenez suffered a fractured skull after a clash of heads with David Luiz in the first half of his side's 2-1 Premier League win at Emirates Stadium on Sunday.
The Mexico international required lengthy medical attention and oxygen before being carried off on a stretcher and taken to hospital, where he is recovering.
David Luiz continued playing after having his head bandaged, but the defender was substituted at half-time after his cut began to bleed again.
The incident has amplified focus on the risk of lasting head trauma to footballers amid a campaign in England for the game's authorities to take greater steps to reduce the danger of later-life health problems such as dementia.
While Arsenal boss Mikel Arteta insisted David Luiz was cleared to continue after adhering to concussion protocols, Alan Shearer, the Premier League's record goalscorer, insisted more must be done to safeguard players from serious head injury.
"Football needs to get real, it needs to wake up, it needs to get serious. Not next year, next month, now. It is not acceptable, it has been going too far too long," Shearer, who has previously presented a documentary on dementia, said on BBC's Match of the Day.
Ederson, a former team-mate of Jimenez at Benfica, told reporters on Monday: "I was very worried. I was watching the game. It was an accidental clash, head to head but very difficult.
"All the concern and all the care at the moment is very important. It is a part of the body that is very fragile and needs special attention, I agree when there is a blow to the head there should be a substitution whether the player can continue or not because you might be feeling okay because you're warmed up, but after the game you could feel the consequences.
"It is something we cannot change, it is accidental. It wasn't an intentional blow they just went to compete for the ball, but we know the risks of a head injury. I hope he recovers quickly and will be back as soon as possible."
City face Porto in the Champions League on Tuesday.