Kirilenko has already missed 13 games this season because of back spasms.
"I'm afraid of giving a timetable, because in the previous occasions, we've given a timetable, but it doesn't work," Kirilenko said.
Kirilenko said this time he needs to take more time off before returning to full contract practice.
"What I'm doing right now is a lot of physical therapy and kind of strengthening the core," Kirilenko said.
"Right now I'm just thinking everyday I'm gradually getting better and better. It's just frustrating because there's a lot of games and you want to play but you're missing so much."
• At one point, before they decided to go with Jason Kidd, it appeared that Brian Shaw was going to be the next head coach of the Nets.
"I thought I had a pretty good chance," Shaw said. "I knew I was the last person to interview for the position. I knew Jason interviewed a few days before me and actually when I did interview Billy King told me he was going to hire Jason or myself.
"I made no secret that I flew cross-country and I got off the plane, got to the hotel and turned on the TV and I saw that it said they were already in negotiation with Jason to be coach. That kind of threw me off a little bit, but I still went through with the interview. Everything happens for a reason and I'm happy with the situation I'm in."
• Paul Pierce (broken right hand) was seen in the locker room wearing a brace on it. Pierce will be out for the next 2-4 weeks.
"I feel like I can do better," said Livingston, who is shooting 22.6 percent from the field in his last seven games. "I'm in a little bit of a slump as far as where I started and where I'm at. It's the grind of the season, being consistent."