Coleman was given oxygen and taken off during Ireland’s 0-0 draw with Wales in Dublin on Friday, after being scythed down by left-back Neil Taylor.
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Taylor was sent off and television broadcasters opted against showing replays of the sickening tackle, with Coleman believed to have suffered a double leg break.
Ireland manager Martin O’Neill said: “Obviously, it’s a real blow to him. He’s having the season of a lifetime at club level.
“He’s a big player for us, a great captain and a great character.
“It’s a big loss to Everton, a big loss to us. But he’ll fight back, I hope. It puts things in perspective.”
Wales boss Chris Coleman said Taylor was “despondent” at the end of a game where Gareth Bale was also lucky to escape a red card for a reckless challenge on John O’Shea.
“First and foremost, the most important thing is Seamus Coleman,” he said.
“We are told that it is not so good, which we are sorry for.
“Neil Taylor is not really that type of player, but it’s a tough one for Seamus.”
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