Corey Webster has this season seen significant time at the point when Johnson has taken a spell on the bench, with CJ Bruton also filling the position in various rotations.
"As a coaching staff, we believe Kerron's going to play, but obviously the contingency is CJ and Corey,'' Vickerman said. "[They're] the two obvious ones that demand more minutes in that scenario. I think they're both ready for it, if needed.''
Vickerman could not confirm who would start in the eventuality of Johnson's absence, with both Bruton and Webster having their drawbacks.
While the six-time Australian NBL champion has plenty of experience in the position, Bruton, at 37, has seen his minutes steadily reduce in recent seasons. Webster, 24, would be able to pick up the majority of the load but, a natural shooting guard, he is still finding his way running the point.
"He's still a natural two-guard and we really need him to play point guard right now,'' Vickerman said. "We want him to see all the options and deliver it and I think he's gotten better at that over the last year - being able to find passes and have a balance between scoring and finding others.''
Mika Vukona was another limited in practice today, after sustaining a knock to his shoulder which stiffened up his neck, but Vickerman was confident he would be fine by game time.
It probably goes without saying, after being unable to string together two wins all season, but the defending champions will be desperate for a win against the Tigers. Next week sees the Breakers visit the league-leading Perth (9-1), kicking off a stretch which sees six out of seven games on the road.