McCullers (shoulder) played catch on Sunday morning, Jake Kaplan of the Houston Chronicle reports.
Eyebrows were raised when McCullers was scratched from his scheduled rehab start Saturday, and it's still not clear when he will take the mound next, but it's a good sign that he was able to throw the ball just one day later. Manager A.J. Hinch said McCullers felt good after Sunday's session, so there's reason to believe he may be able to resume his rehab assignment at some point this week.