During Wales' 1-0 win over Northern Ireland in UEFA Euro 2016's last 16 match, defender Ashley Williams collided with team-mate Jonny Williams, but continued to play until the referee blew the final whistle.
Throughout the last ten minutes, Williams played with his arm almost motionless, which concerned Chris Coleman and the Red Dragon supporters.
However, speaking at a general press conference, the head boss revealed the Wales captain will be fit to face the Red Devils on Friday in the Stade Pierre-Mauroy in Lille.
"We think it was when he fell actually, collided with Jonny and he fell and landed on his hand but with a straight arm, which caused a bit of an impact on his shoulder.
"But he'll be OK. Ash'll be fine. He's a bit bruised and sore, but Ash'll be OK."
The Red Dragons' manager also denied rumors of Williams dislocating his shoulder.
"No, that's not the case, it sounds better, doesn't it? 'He played with a dislocated shoulder, and he would have if we'd let him...' - but that's not true.
"He's probably a little bit more sore today than yesterday just because of the timing, 48 hours after the game, but we'll get him onto the grass as soon as we can. That probably won't be for another day or two.
"I wouldn't say he's a worry or a doubt but we need to look after him. I'd be surprised if he doesn't make the game, so we'll do whatever we need to, give him whatever he needs physically as the best stimulus to get his legs moving and ready for the next game."
The 46-year-old coach added:
"I wouldn't drop him. You have to have faith in your captain, and I've got unlimited faith in Ash. I wanted to take him off because he couldn't move his shoulder, and we had James Collins waiting to take the call on the pitch, which wasn't a problem.
"Ash being Ash, he didn't want to come off, and you have to trust your captain. I think we were right to do that. He thrives on that."
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