From George King:

Clemens yesterday told Houston television station KRIV there is an 80 percent chance he is going to end his Hall of Fame career by retiring.

"[Clemens' son] Koby asked me [Thursday] when we were working out; he was doing more of a workout than I was," Clemens said. "I still told him, 80-20 that I wasn't going to play."

Via PSD.