The Bulls will play their Super Rugby match in Tokyo against the Sunwolves without four players who have all returned home due to injury.
The Bulls lost to the Chiefs in New Zealand and four players were unable to continue to Japan and have all returnedto South Africa via Auckland, while the replacements will fly straight to Tokyo to join the squad.
Conrad van Vuuren, who joined the squad in Hamilton following a hamstring injury sustained to John-Roy Jenkinson after the opening tour match against the Blues in Albany, injured his ankle in training and will return home. He will be replaced by Martin Dreyer.
Arno Botha, who started against the Chiefs on Saturday in place of injured Hanro Liebenberg, is out with a knee injury and will be replaced by Jacques Potgieter, who missed the tour due to concussion. Liebenberg is expected to be fit for the match against the Sunwolves.
Flanker Ruan Steenkamp has picked up ear and knee injuries and will be replaced by Franco Naude, a midfielder. Dries Swanepoel (centre) was earlier replaced by flyhalf Francois Brummer.
Piet van Zyl is also returning home due to a lower back injury. Ivan van Zyl replaces him.