There has been a report today by MLB insider Jon Heyman that Steven Matz was diagnosed with a mild shoulder strain and rotator cuff irritation after meeting with team doctors in New York today. This surely means that Matz will not make his next scheduled start on Thursday against the St. Louis Cardinals in a critical series with postseason implications.

The most likely scenario at this point is that Matz is sent to the 15-day DL as he already would have missed two starts due to his shoulder woes. Seth Lugo is on the odds on favorite to get the start Thursday night for the Mets. The 26-year old Lugo threw 6.2 innings of three run ball despite taking the loss against the San Francisco Giants on Friday night.

Matz who is already pitching with a bone spur in his left elbow, took a no-hitter into the eighth inning, on 105 pitches against the San Diego Padres in his last start on August 14th. The 25-year old left-hander has always been labeled with injury concerns, and it is a disappointing development for both him and the Mets, as the Mets can’t seem to shake injuries to their roster this season. There is no timetable as to how long Matz will be out, but at the minimum we shouldn’t expect to see him for a couple of turns through the rotation.

Matz had posted a 9-8 record with a 3.40 and 129 strikeouts in 132.1 innings this season.

*(UPDATE: 4:00 PM CT)*: MLB Insider Ken Rosenthal is reporting that the New York Mets will recall right-handed pitcher Robert Gsellman in a corresponding move. According to Rosenthal the plan is for Gsellman to pitch out of the bullpen for the Mets initially. The 23-year old pitcher was scratched from his start in Las Vegas today which suggested he may be heading to St. Louis to join the big league club.

Gsellman is ranked 14th by MLB.com in the Mets farm system and he has posted a combined 4-9 record with a 3.99 ERA and a 88/31 K/BB split in 20 combined starts between Double-A and Triple-A.