Hull City have announced Ryan Mason has suffered a fractured skull and is in a stable condition in hospital.
The midfielder has undergone surgery at St Mary's Hospital in London following a clash of heads with Gary Cahill during the first half of Sunday's 2-0 Premier League defeat at Chelsea.
Mason is expected to remain in hospital for the next few days.
Players and clubs from across England and Europe sent best wishes to the 25-year-old via Twitter.
Zlatan Ibrahimovic cannot understand why record-breaking Manchester United team-mate Wayne Rooney is so unappreciated and undervalued.
On Saturday the 31-year-old broke Sir Bobby Charlton's all-time United scoring record in sumptuous fashion, bending home an exceptional free-kick to secure a last-gasp 1-1 draw at Stoke.
"He's a complete player," the Swede said. "Off the field he's a real leader and on the field he's just complete.
"He helps his team-mates well and has that big quality - he knows how to score goals, knows how to assist.
"But he works very hard, he's got a good attitude and spirit.
"Everybody knows what Wayne is. But this country has to appreciate him.
"I don't see any other strikers like him today. Give me some names. Tell me. And still you're not happy."
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Im delighted to announce the signing of England U19 international Nathan Holland on a three-and-a-half-year deal. G… https://t.co/7mkyM59Ok1
West Ham have signed England Under-19 international Nathan Holland on a three-and-a-half-year deal.
The former Everton youngster has moved to the London Stadium on a deal until 2020. He failed to make a senior appearances for the Toffees after joining the Goodison Park club when he was nine.
"It's amazing, I'm quite gobsmacked to be honest," Holland told the club's official site.
Hull midfielder Ryan Mason was taken off on a stretcher following a nasty clash of heads during the first half of Sunday's Premier League fixture at Stamford Bridge.
The 25-year-old former Tottenham player and Chelsea's Gary Cahill collided in Hull's box after 14 minutes.
Both medical teams rushed to the scene as referee Neil Swarbrick stopped play.
Cahill recovered quickly, but Mason received treatment for around six minutes before departing on a stretcher, while receiving oxygen.
Mason was taken by ambulance to hospital for further assessment.
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Striker Diego Costa was restored to the Chelsea starting line-up at the first opportunity when the Premier League leaders met Hull at Stamford Bridge.
Costa missed last weekend's win at Leicester with a back injury, amid reports of a bust-up with Antonio Conte and his staff, as well as speculation over a move to the Chinese Super League.
The 28-year-old replaced Willian in the only change to the starting XI, returning to make his 100th Chelsea appearance.
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