The Blues will host the southerners at Eden Park on Saturday, with a 7.05pm kick-off.
MacDonald said a number of the squad have pressed hard for inclusion but the current group continued to prove themselves on the paddock.
The only change comes in the reserves where England international Joe Marchant is included in what will be his final match for the Blues before returning to his Harlequins club in London.
“The whole squad are training hard, and our current starters are getting tested at every training session, which is what we want,” said MacDonald.