The Astros released Kazuo Matsui on the 19th (or more accurately, placed him on waivers). According to reports, Matsui was informed of the clubs decision after the game on the 19th by the general manager.
If no teams claim Matsui by the 24th, he will become an unrestricted free agent.
Which begs the question, what will Matsui do next? Does he stick it out and see if he can find another suitor in the States, or does he make a return to the NPB?