Rajon Rondo and his protected left elbow appear ready to help the Celtics rise to another NBA finals. (AP)

WALTHAM — The Celtics spent Thursday morning in typical gameday mode, preparing for Game 6 of the Eastern Conference finals at TD Garden against LeBron James and the Heat. All 14 active players were present and accounted for as the team went through half-court sets and shooting drills in anticipation of the game that – if they win – would propel them to the NBA finals for the third time in five seasons. The Celtics lead the best-of-seven series, 3-2.

Ray Allen and Rajon Rondo were among the Celtics in attendance. Both had minor injury issues in the Game 5 win in Miami. Allen had to leave the game for the locker room midway through the third quarter to get treatment for his sore ankles while Rondo suffered a cut on his left arm but both returned to the game and are expected to be fully ready for the potential series-clincher at the Garden. Rondo shot just 3-of-15 in Game 5 while suffering the injury to the same arm on which he dislocated his left elbow in 2011.

“I don’t know what happened there, I think he got slashed or cut,” said Rivers of the Rondo injury on Wednesday. “I pay zero attention to injuries and never ask about them. I don’t want to know about them.”

If the Celtics prevail in Game 6, they will have a day off and then prepare for the Thunder in Game 1 of the NBA finals next Tuesday in Oklahoma City. If the Celtics lose Thursday night’s game, they will have to head back on a plane Friday and travel to Miami for Game 7 on Saturday night at American Airlines Arena.