The Mets were surprised when Matz said he had a flexor tendon injury, according to Klapisch, who said the Mets' doctors did not come to that conclusion and that the Mets believe Matz was seen by a different doctor.
Matz had told Newsday's Marc Carig that his injury is "like a flexor strain, I strained my flexor. That's kind of what the feeling is, that the flexor tendon is kind of flaring up."
Mets GM Sandy Alderson said on Wednesday that the team is hopeful Matz will return soon and that it did not appear Matz had a specific injury.
"It's worrisome that he continues to be injured off and on," Alderson said. "That's the difficulty. We don't think it's serious. On the other hand, starting pitchers are relied on every five days. I'm not sure exactly where this is going to take us."
Matz, 25, underwent surgery at the end of last season to remove a bone spur in his left elbow. In 22 starts for the Mets last season, Matz went 9-8 with a 3.40 ERA.