Allen: 'Williams is back to his best'

The pair, who both play for Stoke City, are in the squad for Wales' games against Spain and the Republic of Ireland over the international break.

Williams suffered a punctured lung when Wales played Mexico on 29 May.

"He's worked hard to get himself back fit and certainly back to his best in my opinion," said Allen.

Williams is on loan at Championship side Stoke from Premier League side Everton and Allen said: "He's made a big difference to us in recent weeks."

Wales will be playing at the Principality stadium for the first time since 2011, as their home since then has been the Cardiff City Stadium.

Speaking about the return to the 74,500 seater stadium, Allen said: "I can't wait. As a team we've come a long way since we last played there.

"It's a great game against Spain to look forward to as well so I'm sure the atmosphere and support will be great there as well.

"It's a good chance for a lot of the lads to play there for the first time."