Riveiro has been suspended at a time when Pirates are pushing to close in on log leaders Mamelodi Sundowns.
The Buccaneers have 12 points fewer than Masandawana and they also have three games in hand, giving hopes of at one time overtaking the Brazilians.
Pirates will be hoping Riveiro's absence from the bench does not affect the team on the pitch other members of his technical team are expected to be firmly in control of proceedings during the match.