The first of three T20 internationals is in Durban early on Saturday. Pitch conditions are expected to be quicker there than what Munro called a strip which was "a bit tennis bally" yesterday.
McClenaghan said he'd not been clocked by a speed gun yet. If selected for Durban he hopes not to be caught short by the technology.
"You don't want to get your hopes up. You don't want to see it come up at 135 [km/h]. That would be a bit embarrassing," he laughed. "You can't get carried away but it will be good to see what it is relative to the big boys like [South African pace stars] Dale Steyn and Morne Morkel."
Senior allrounder James Franklin likes what he's seen of the younger players. "They've got no baggage so they just want to get stuck in and see where they fit in in terms of the team and international cricket."
Opener Martin Guptill is sure to return for the Durban match and at least one of Trent Boult and Doug Bracewell to bolster the experience of the bowling group.
South Africa, already without Jacques Kallis, AB de Villiers, Hashim Amla and hard-hitting allrounder Wayne Parnell, will be led by batsman Faf du Plessis.