Houston Astros pitcher Justin Verlander is currently behind schedule, per the Astros beats. Verlander has apparently said he is a couple of weeks behind schedule, with his timetable for when he will be ready to be determined.
Verlander says he had a “hiccup” that has resolved itself, which you can hear him discuss in that link. He explained his shoulder didn’t feel good when he normally would start throwing again, and when asked about whether he’d be ready for Opening Day, he said it was too far out to really say.
This is a fairly common thing to see at the beginning of spring training, particularly with older pitchers like Verlander, who turns 41 later this month.