The Houston Astros may be without Lance McCullers, Jr. to begin the season.

McCullers, Jr. suffered a flexor tendon strain in Game 4 of the ALDS. He was then left off the ALCS and World Series rosters. 

During an appearance on Maanav's Sports Talk, McCullers admitted the injury was "much worse than we were putting off ... I had a pretty good strain in my flexor tendon in my forearm, it was off the bone quite a bit."

He added he is "behind" in his rehab work and may not be ready for Opening Day.