Greinke (COVID-19 IL) will throw a bullpen session Friday, Chandler Rome of the Houston Chronicle reports.
Greinke returned to the Astros and threw off flat ground Monday after spending just under a week away from the team. His resumption of mound work is an encouraging development, as it signals that he could return to the rotation as early as next week. With that said, the team has yet to pinpoint when Greinke will make his next start, and it remains a possibility that he will throw a simulated game before being activated.