One of the most important pieces of the Detroit Lions ' vaunted offensive line is hanging up the cleats.

Center Frank Ragnow on Monday announced his retirement on Instagram after seven seasons, four Pro Bowls, and three second-team All-Pro honors.

Ragnow was not been present at the team's OTAs last week, and it appears this is the reason why.

"These past couple of months have been very trying as I've come to the realization that my football journey is ending and I'm officially retiring from the NFL," Ragnow wrote on Instagram. "I've tried to convince myself that I'm feeling good but I'm not and it's time to prioritize my health and my (family's) future. I have given this team everything I have and I thought I had more to give, but the reality is I simply don't."

Ragnow continued, "I

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