Wales' Williams and Biggar out of World Cup warm-up with Springboks
Liam Williams and Dan Biggar will miss Wales' final Rugby World Cup warm-up against reigning champions South Africa on Saturday.
Both players had been selected to start the match in Cardiff, but have been withdrawn as a precautionary measure.
The Welsh Rugby Union said Thursday that full-back Williams had a tight hamstring, with fly-half Biggar suffering from back irritation.
Cai Evans comes off the bench to make his Test debut as Williams's replacement, with Sam Costelow replacing Biggar at stand-off.
Evans's position among the replacements is filled by Scarlets back Tom Rogers.
Revised Wales team to play South Africa (15-1)
Cai Evans; Alex Cuthbert, Mason Grady, Johnny Williams, Rio Dyer; Sam Costelow, Kieran Hardy; Aaron Wainwright, Jac Morgan (capt), Dan Lydiate; Will Rowlands, Ben Carter; Keiron Assiratti, Elliot Dee, Corey Domachowski
Replacements: Sam Parry, Nicky Smith, Henry Thomas, Teddy Williams, Taine Basham, Tomos Williams, Max Llewellyn, Tom Rogers
Coach: Warren Gatland (NZL)