Wolves say striker Raul Jimenez is "comfortable" after undergoing an operation on a fractured skull suffered in their win over Arsenal on Sunday.
Jimenez was stretchered off following a clash of heads with Arsenal defender David Luiz and was given oxygen after the accidental coming together.
In a statement on Monday, Wolves said: "Raul is comfortable following an operation last night, which he underwent in a London hospital.
"He has since seen his partner Daniela and is now resting. He will remain under observation for a few days while he begins his recovery.
"The club would like to thank the medical staff at Arsenal, the NHS paramedics, hospital staff and surgeons who, through their skill and early response, were of such help.
"The club ask that Raul and his family are now afforded a period of space and privacy, before any further updates are provided in due course."
Wolves captain Conor Coady said the thoughts of everyone on the pitch were with Jimenez and Luiz after the incident.
Coady went up for the header immediately behind Jimenez and Luiz and admitted both sides were shaken by the collision.
Speaking after the game, Coady said: "This happens in football but you don't like to see it and I think both sets of teams went out and then played properly.
"It was a tough thing that happened. He is with the right people and that's the most important thing but we just hope and pray that everything is OK because he is the one we are thinking about right now.
"I was at the front just behind him, so I jumped with them as well and you hear it and, as they dropped, he was on his side. It's something we never want to see."
Headway: How many warnings does football need?
Despite also suffering a head injury in the clash, Luiz was allowed to continue with a bandaged head after receiving seven stitches in a three-inch wound.
The Brazilian returned to the pitch but was withdrawn at half-time with Rob Holding his replacement.
Brain injury association charity Headway released a statement on Monday expressing its "anger and disappointment at football's continued failings to protect its players from concussion" and reiterated its view that temporary concussion substitutes are "urgently" needed.
Headway questioned whether Luiz would have been cleared to continue if concussion substitutes were in place.
Luke Griggs, deputy chief executive at Headway, said: "Too often in football, we see players returning to the pitch having undergone a concussion assessment - only to be withdrawn a few minutes later when it is clear that they are not fit to continue.
"That is the very reason why we urgently need temporary concussion substitutes in football. You simply cannot take a risk with head injuries. They are not like muscular injuries where you can put a player back on 'to see if they can it if off'. One further blow to the head when concussed could have serious consequences.
"The question that has to be asked is had the concussion substitutes rule been in place, would Luiz have been allowed to return to the field of play? Would that extra time in the treatment room have led to a different decision being made?
"The concussion protocol clearly states that 'anyone with a suspected concussion must be immediately removed from play', while the sport continues to promote an 'if in doubt, sit it out' approach to head injuries.
"Time and time again we are seeing this rhetoric not being borne out by actions on the pitch. Something is not right. This cannot be allowed to continue. How many warnings does football need?"
The International Football Association Board (IFAB) said its Concussion Expert Group (CEG) had met on Wednesday and said it was now preparing the ground for competitions to test new protocols for concussion substitutes, with trials set to begin as early as January next year.
"The members (of the expert group) recommended further consultation, working with the FIFA medical subdivision and other stakeholders, to facilitate trials to start from January 2021 for any competition that is interested in taking part," a statement on the IFAB website read.
The statement also said: "The CEG again emphasised that the protection of players is the main goal and that a clear and uniform approach is needed, which can operate effectively at all levels of the game.
"Therefore, the group agreed that applying an 'if in doubt, take them out' philosophy would be the best solution to safeguard the health of football players."
What's the procedure for referees?
Former Premier League match official Dermot Gallagher:
"It is to immediately stop the game, which is what Michael Oliver did. Everyone knew that Jimenez was injured, and Michael stopped the game straightaway for the relevant personnel to come on and check.
"At every game there is a designated doctor in the tunnel - the red area as it is known now - and he judges whether the player has got concussion and whether he can continue, which was more relevant in this case for David Luiz. Everybody knew that Jimenez was never going to continue.
"I was in this situation quite a few years ago when I unfortunately did the game where David Busst broke his leg very early in the game. The players around him can't do anything to help, and the best thing for the referee to do there is to take them away.
"That is what Michael Oliver did at the Emirates. He sent them down the other end, got footballs on, he knew it was going to be a long time. It occupied their minds, kept them warm and focused on the game, and that leaves the relevant bodies to get on with their job. It was a really good move by Michael."
Can referees make a call on suspected concussion?
"Michael, or any other referee, is not qualified to make that decision," Gallagher added.
"If he does suspect, in this example David Luiz, may have concussion or is looking a little bit groggy on his feet, he will ask the relevant person to come on and assess him.
"In that situation you need someone who is an absolute expert in that field."
Source: Sky Sports