Everton midfielder Andre Gomes has undergone surgery on a fracture dislocation to his right ankle, with the club saying the procedure went "extremely well".
Gomes, 26, suffered the shocking injury when he fell awkwardly following a challenge from Tottenham's Son Heung-min in Sunday's 1-1 Premier League draw draw at Goodison Park.
"Everton Football Club can confirm Andre Gomes underwent surgery to repair a fracture dislocation to his right ankle earlier today and the procedure went extremely well," a club statement said.
Gomes is expected to be sidelined for anywhere between six months and a year given the seriousness of the injury, which left players from both sides visibly upset on the pitch at Goodison Park.
His injury overshadowed what had been a poor match.
Though Everton cancelled out Dele Alli's opening goal with a Cenk Tosun header deep into the 12 minutes of time added on following Gomes' injury, there was little sense of celebration at full-time.
That Everton were able to force an equaliser was a credit to the players in the circumstances, although Tottenham's players were also affected with Son - who was sent off for the tackle after initially being shown a yellow card - in tears and Serge Aurier, who collided with Gomes, substituted.
Tottenham are considering an appeal against the red card shown to Son, who slid in and clipped his opponent but not recklessly so.
The north London club will also offer Son their full support, which could also include psychological counselling following his obvious on-field distress following the incident.
A Premier League statement said the card was shown for "endangering the safety of a player" but Tottenham manager Mauricio Pochettino felt the injury led to an over-reaction.
"It was clear it was never the intention of Son to create the problem that happened afterwards. It is unbelievable to see a red card," said the Spurs boss.
He added: "We all feel sorry for Andre. I want to send my best wishes to him and to his family in this tough moment. We want to send, on behalf of the squad, our best wishes."
Australian Associated Press