The Celtics planned to retool their roster this offseason, but Miami's big move to sign LeBron James and Chris Bosh forced Boston's hand.

"We were already going to try and get better, get tougher," Grousbeck said. "But then the Miami thing just took it to a new level."

Boston added Jermaine O'Neal and Shaquille O'Neal to help with their rebounding.

"I don't have an assessment of other guys, but I do know that we needed size and now we're the biggest team in the league," Grousbeck said. "With [rookie] Semih Erden, we added three, 7-footers."