Regardless, Nanai-Williams has been impressive. His try after skipping past Highlanders second-five Ma'a Nonu in the first game of the season would have piqued the All Blacks' selectors' interest and he maintained his form despite the injury, though he appeared tired in the Highlanders' rematch in Hamilton last weekend following the team's return from South Africa.
"He's really enjoyed it as well,'' Rennie said. "We're really happy with Timmy. He's a real threat with the ball, he's got great feet, he's good post-tackle and one of our best distributors so we're pretty happy with how he's going.''
Rennie and the Chiefs are lucky Richard Kahui is fit enough to slot in for Nanai-Williams after his 30-minute stint off the reserves bench last weekend. Kahui not only adds size to the Chiefs' backline, he will also stiffen its defence against a Blues team boasting such threats as Rene Ranger and Charles Piutau.
More fortune has come in the form of Brendon Leonard, fit again to return from a cheekbone injury to cover halfback following Tawera Kerr-Barlow's broken jaw.
Aaron Cruden's groin injury was improving, but Gareth Anscombe would take the goalkicking duties again. Rennie said he considered resting Cruden, who started every game for the Chiefs last season, but with fullback Robbie Robinson suffering a setback in his recovery from a foot injury, he decided to go with the status quo.
An interesting change comes in the replacing of flanker Sam Cane with Tanerau Latimer. This season Cane has started four matches of five, a turnaround from last year when Rennie preferred to start with Latimer, despite the now 21-year-old making the All Blacks squad.
"He's in the All Blacks, he's a better player now than he was this time last year,'' Rennie said of Cane. ``His starts have been warranted based on his training performance and [the way he has been] playing. It's not easy for Lats either, he's pretty keen to start and he's been fantastic off the bench for us.''
A victory for the Chiefs would strengthen their position at the top of the New Zealand conference and consign the Blues to their third consecutive defeat.
The Chiefs team to play the Blues at Baypark Stadium, Mt Maunganui, on Saturday, kick-off 7.35pm, is: Gareth Anscombe, Lelia Masaga, Richard Kahui, Bundee Aki, Asaeli Tikoirotuma, Aaron Cruden, Augustine Pulu, Fritz Lee, Tanerau Latimer, Liam Messam (c), Brodie Retallick, Michael Fitzgerald, Ben Afeaki, Hika Elliot, Toby Smith. Reserves: Rhys Marshall, Ben Tameifuna, Nick Crosswell, Sam Cane, Brendon Leonard, Andrew Horrell, Patrick Osborne.
Blues: Charles Piutau, Frank Halai, Rene Ranger, Francis Saili, George Moala, Chris Noakes, Piri Weepu, Peter Saili, Luke Braid, Steven Luatua, Ali Williams (c), Culum Retallick, Angus Ta'avao, James Parsons, Tom McCartney. Reserves: Quentin MacDonald, Ofa Tu'ungafasi, Anthony Boric, Brendon O'Connor, Jamison Gibson-Park, Baden Kerr, Jackson Willison.
