Gabrielle McMillen Omnisport @GabbyMcMillen Updated at 11:36 a.m. ET Updated at 11:36 a.m. ET The Rockets are losing a huge part of their staff before the season even starts. Associate head coach Jeff Bzdelik will be retiring before the season begins next month, ESPN reported, citing league sources. Bzdelik, 65, reportedly told coach Mike D’Antoni and general manager Daryl Morey of his decision on Sunday. His health is not a factor. Bzdelik is credited with bolstering the Rockets defense over the past two seasons, helping the team rank No. 6 in that category. Rockets assistant Roy Rogers is expected to take over defensive duties. In his 30-year career in basketball, Bzdelik worked as a scout before joining the Knicks under Pat Riley. He became the coach of the Nuggets from 2002-04, helping them to the playoffs in his last season with the team. Read This NBA free agency news: Dwyane Wade announces he’s returning to Heat for ‘one last dance’ E.Jay Zarett Bzdelik also took on various coaching roles with the Heat and Grizzlies. He spent time as a collegiate coach, leading Maryland-Baltimore County, Colorado, Air Force and Wake Forest over 11 seasons. His Air Force team made it to the NCAA Tournament in 2006, but lost to Illinois in the first round.