Acknowledging the uncertainty about injured sparkplug sixth man Bobby Jackson, the Kings filled out their playoff roster Thursday by activating swingman Gerald Wallace from the disabled list and discarding veteran center/power forward Tony Massenburg.
Kings president Geoff Petrie said Thursday the abdominal strain that has hampered Jackson the past eight weeks could force the guard to miss the first-round series against the Dallas Mavericks.

"I honestly don't know if Bobby Jackson is going to play," Petrie said. "It's more and more unlikely that he will."

The reason Massenberg was left off the playoff roster was a lack of minutes available, according to coach Rick Adelman.

"I didn't really see a chance of him getting (into the game)," Adelman said, noting that he plans to use Chris Webber, Vlade Divac, Brad Miller and Darius Songaila at center and power forward. "I asked everybody on the coaching staff and in basketball operations, and it was pretty unanimous. I think Tony really has been unhappy with his role... If we played Houston, would we have done something different? I don't know."

"I think we need everybody on-board positive at this point."

Petrie didn't expect Massenburg, who reportedly packed boxes before he left the practice facility, to be with the team during the playoffs.

"I appreciate his efforts, and we'll try to do the best we can without him," Petrie said of the physical Massenburg, who averaged 4.3 points, 3.2 rebounds and 13.4 minutes in 59 games this season."