Williams fit for SA trip
The squad travelled to South Africa after their impressive 50-32 Super Rugby victory over the Cheetahs at Eden Park.
Williams sustained a head injury during his side's Super Rugby win against the Waratahs in Sydney last week.
The centre is joined by Matt Duffie, who was also absent from the Cheetahs' game, and a mandatory third hooker, Joe Royal.
*Meanwhile, prop Pauliasi Manu and flyhalf Ihaia West will miss out on the touring squad after their sustained injuries on Friday.
Manu, who has started every game this season, left the field early with a calf injury while West injured his ankle when he came on as a substitute for Piers Francis who had received an injury in the first half.
Manu has been replaced by Sione Mafileo, with Bryn Gatland re-joining the Blues as a replacement for West.
Gatland played three games for the Blues as a replacement but exited the squad on Thursday before the late call to travel to South Africa. Francis was considered fit enough to travel with the touring party.
Blues squad: Ofa Tu’ungafasi, Charlie Faumuina, Sione Mafileo, Alex Hodgman; James Parsons, Hame Faiva, Joe Royal; Patrick Tuipulotu, Scott Scrafton, Gerard Cowley-Tuioti; Steven Luatua, Blake Gibson, Akira Ioane; Kara Pryor ; Augustine Pulu, Sam Nock; Piers Francis, Bryn Gatland; TJ Faiane, Sonny-Bill Williams, George Moala, Matt Duffie, Rieko Ioane, Melani Nanai, Michael Collins.