Should Astros fans be worried about the club potentially losing three-fifths of its 2018 starting rotation?

"If you're not worried, you're stupid," says former Astros all-star and manager Larry Dierker in general terms.

Pitcher Lance McCullers Jr. had Tommy John elbow surgery and will miss 2019, while both Dallas Keuchel and Charlie Morton could be lost during free agency. “No matter how good you think you are, there’s always somebody who got better between last year and this year,” he added.

Dierker now blogs and produces podcasts for his baseball website, www.49sFastball.com.