Steven Matz revealed that he's been suffering from a strained flexor tendon, but New York Mets have been asking who made the diagnosis.

"Our [doctors] found nothing wrong," said one source with knowledge of Matz's care.

The Mets don't know what's wrong with Matz and when he'll be able to pitch again.

Matz has reported discomfort in his pitching elbow despite an MRI showing no damage.