Craig Sager and his flashy, eye-poppingly colorful suits may not be on the sidelines for the NBA playoffs. His son, Craig Sager II, tweeted Thursday night that his father will be starting treatment for acute leukemia on Friday.

Craig Sager II posted photos of his father along with the sad news.

The younger Sager tweeted they planned to watch a lot of the postseason together — while hatching new ideas for his un-traditional suits.

My Dad's 3-4-week acute leukemia treatment starts tmrw.Be thinking of him & let's get him back on the sidelines soon pic.twitter.com/5CNI55p2Gx

— Craig Sager II (@CraigSagerJr) April 17, 2014