Oklahoma State’s offensive line depth has suffered a big hit for 2018.

Junior center Tyler Moore announced on twitter Monday afternoon that he is retiring from football because of back injuries.

“This is gonna be a hard one. For those who do not know,, I had a Lumbar Microdiscectomy on both my L4 and L5 vertebrate in my back in March earlier this year. I have been through rigorous rehab since and have faced trials and tribulations that has shaken me to my foundation. This didn’t worry me, I knew exactly what I was getting into; I did this for the love of my sport and the people that I have met through it and I was okay with that. In my treatments I have had many set backs, but none as bad as this recent episode. I began to experience recurring symptoms that I had before my surgery, such as harsh pain in my back and shooting pains coming down my legs; which also includes not having sensation in my right foot since my injury. Me and my family went to see my surgeon to see exactly what was going on and discussed a potential revision surgery for my back, making a total of two back surgeries at 21 years old. It deeply saddens me to tell y’all that I am pursuing a medical retirement from my football career here at OSU. This decision was not made hastily or lightly, and was made in consideration of my future quality of life after football. I want to thank Coach Gundy and all the support staff at Oklahoma State for accepting me into their family and letting me continue my education, which otherwise might not have been possible without.”

Moore is a 6-foot-4, 305-pound center from Galena Park, Texas who transferred to Minnesota back in January. He started 20 straight games at center for the Gophers before suffering the back injury that forced him to have surgery.

While he never saw the field for OSU and was sitting out this season due to NCAA transfer rules, the loss is a blow to the Cowboy’s line depth in the future. Moore would have been one of the front-runners to replace senior Brad Lundblade, who will exhaust his eligibility at the end of the season.