ijjysmith
Calm
The central defender suffered the injury against Northern Ireland on Saturday and had his arm in a sling during the post-match celebrations
Belgium captain Eden Hazard is also fit to play after a thigh injury.
But Thomas Vermaelen is suspended and fellow defender Jan Vertonghen twisted his knee in training and is out.
"Gutted to say that my Euros is over," tweeted Spurs defender Verthonghen, while Hazard said: "I am used to playing with Jan on the left, we will have to adapt."
Vertonghen had been playing at left-back at Euro 2016 but it was thought he would move alongside Toby Alderweireld in the centre of defence to replace Vermaelen.
Meanwhile, Williams paid tribute to the Welsh medical staff after declaring himself fit to face the Belgians.
"Obviously it was hurting a lot at the end of the game, but a lot of credit goes to the medical staff," he said.
"They've done a great job on me and I've trained in all the sessions this week. It's in good shape and I'm sure it'll be fine."
Manager Chris Coleman added: "I'm just relieved. Maybe I'm old-fashioned, but you need leaders in your side.
"We've got a really good dressing room, a good blend, and Ash is the captain. When you have a strong dressing room you need a strong character to lead it, and Ash is that."
Wales quartet Ben Davies, Aaron Ramsey, Neil Taylor and Sam Vokes are all one booking away from suspension after picking up yellow cards earlier in the tournament.
Belgium captain Eden Hazard says his side will have to work hard to penetrate the Wales defence in their quarter final showdown.
Hazard played when Wales won thanks to a Bale goal at Cardiff City Stadium in June 2015.
"We didn't create too many chances against Wales in recent times," Hazard said.
"We struggled to score goals. They've got a large defensive block, they play with five at the back, they're difficult to displace.
"They've got top players in the middle of the park and a real superstar up front. I hope that tomorrow's match will be different to the last one we played against them.
"I hope we can create a lot of chances and score goals"
Forward Gareth Bale says Wales have improved since that win - and believes the result gave them "belief that we can take on and beat the big teams".
Bale also claims it may give Wales a psychological edge on Friday.
"We're like their bogey team, aren't we? Hopefully that edge gets into their heads - you never know," he said.
"We will definitely draw on those qualifiers. We know how to play against them and how they play."
The Welsh squad evidently take great satisfaction at being the last home nation standing at Euro 2016 - but victory against Belgium on Friday would be a result no-one could begrudge them celebrating.
Marc Wilmots' star-studded squad are ranked second in the world and have shown ominous signs of finding their best form in the last fortnight. After the disappointment of defeat by Italy in their opening match, the Belgians have recovered impressively, winning their subsequent three games and scoring eight unanswered goals.
However, Wales have a clear template for how to beat Belgium, having kept clean sheets in both meetings during Euro 2016 qualifying.
Their game-plan then was to sit deep, stifle and occasionally pounce on the counter-attack - a ploy which enabled the Welsh to earn a goalless draw in Brussels in November 2014 and a 1-0 victory in the return fixture last summer.
Waleslast 5 matches (most recent first):
25/06/16 (h)Northern Ireland 1-0 W
20/06/16 (a)Russia 0-3 W
16/06/16 (a)England 2-1 L
11/06/16 (h)Slovakia 2-1 W
05/06/16 (a)Sweden 3-0 L
Belgiumlast 5 matches (most recent first):
26/06/16 (a)Hungary 0-4 W
22/06/16 (a)Sweden 0-1 W
18/06/16 (h)R. of Ireland 3-0 W
13/06/16 (h)Italy 0-2 L
05/06/16 (h)Norway 3-2 W
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