The match at DHL Stadium kicks off at 14h00 and is the SA U20s’ last World Rugby Under-20 Championship fixture.
Apart from Finca, three more players were also ruled out of selection for Friday's clash with Wales in Cape Town: Tiaan Jacobs (ankle), Michail Damon (groin) and Thabang Mahashe (concussion).
According to team physician, Dr Clement Plaatjies, the short turnaround time between matches means it’s a challenge for injured players to recover in time for the next match.
“Minor injuries take about a week to recover from, but the time frame of this competition means it is a challenge to do that,” said Dr Plaatjies.
“I think it’s a testament to our conditioning that, up to now, we've been able to cope well with getting the majority of players to be in contention for selection.”
Junior Bok coach Bafana Nhleko will announce the team for Friday’s seventh-place playoff against Wales at 15h00 on Wednesday.