Roy said the addition of veterans Andre MIller and Juwan Howard have contributed to a more business-like focus by the other players.
"There's not as much joking around," Roy said. "We're not as young of a team. I can tell guys have matured a lot. A lot of that has to do with Andre. He's an older guy and Juwan is around."
Roy added that he can already see the benefits of playing alongside Miller. The informal workouts the players have had this month has helped Roy get a better feel of Miller's abilities on the court.
"It's just his passing. I'm out there playing with him and you always have to be ready," Roy said. "He makes passes that...I know I'm afraid to make. He threads the needle."