Bournemouth midfielder Lewis Cook will be out for up to nine months after suffering a ruptured anterior cruciate ligament, the club have confirmed.
The 21-year-old England international suffered the injury during the 2-1 Premier League victory over Huddersfield on Tuesday, and scans revealed the extent of the damage to his right knee.
"We are all devastated for Lewis," Bournemouth manager Eddie Howe told the official club website.
"It is a huge blow to a very talented player who has been a very important part of our side over the last 18 months."
Howe added: "Lewis is a strong character who only has to look around our dressing room for inspiration of how an injury like this is merely a setback and to know that he can come back better than ever.
"He will have the full support and love of everyone at the club throughout the next few months as he receives the very best treatment and rehabilitation possible."
Cook has made 56 appearances since joining the Cherries from Leeds in July 2016, 15 of those coming this season.
He captained England to Under-20 World Cup glory in 2017 and won his first senior cap against Italy in March.
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