The 21-year-old will head to the World Cup in the next couple of weeks as Wales make their first appearance since 1958.
Williams will join Brennan Johnson and Wayne Hennessey in Rob Page’s ranks as they aim to topple England in Group B.
The ex-Liverpool youngster signed for the Reds in the summer. He cost £17 million and has been a regular in Steve Cooper’s team.
Williams is still busy learning his trade. Over time, he’s showcased the potential that he can become a big player in the Premier League.
It would seem as though, Manchester United were an option when the defender was starting out on his football journey.
His dad has now claimed that the Red Devils were in for him prior to him penning terms with the Anfield giants.
He told BBC Sport: “By eight he had a decision to make, to either go to Manchester United or Liverpool.
“I’ve been a Manchester United supporter since I was young but I said, ‘listen, it’s up to you, which one do you prefer?’
“He preferred Liverpool. He had lots of his friends already there.”
Williams rejected Manchester United
It may have been something of a wrench for Williams to leave a club like Liverpool during the summer.
He spent all of his youth days at Anfield and one time it looked as though he might burst onto the scene.
Williams made 33 appearances in all competitions for Liverpool and for a while competed with Trent Alexander-Arnold for a place.
Jurgen Klopp never really seemed convinced though. Last season, he spent the second half of the campaign on loan with Fulham.
His spell with the Cottagers seemed to suggest that perhaps his time at Liverpool was drawing to a close.
He made 15 appearances there and earned himself a permanent move to Forest during the summer.
It’s a case of so far, so good from Williams who has showcased the ability to play in either full-back role.
He’s made 14 appearances for the Reds and there will be more to come as he gets used to the way Cooper likes his teams to operate.
Next on the radar for Williams is a trip to the World Cup with Wales.