According to the Courier Post Online, Sixers president Billy King called this season the most frustrating of his career and also said he knows certain players won't be back next season, saying he wants more defensive-minded players who are tough.
King also pointed the finger at himself for some of the Sixers' problems.
They are 36-41 after beating Washington on Monday and are in the eighth playoff spot. If they were tied, the Bulls hold the second tiebreaker, a better conference record.
"After the trade deadline, I looked in the mirror and said I've got to do a better job," King said. "It's been the most frustrating year in my involvement in basketball."
King added: "There's some guys I know for sure won't be back."
He said he must make "tougher decisions."
"Sometimes it's easy to make a decision, like I'm gonna re-sign this guy or sign that guy," he said. "I'm gonna roll the dice and sign-and-trade this guy to go get that guy."
"Last year, I went in with the approach of retaining our free agents, this year we're going in that we're gonna build a team that starts with defense. Not just defensive guys, guys with an attitude."