Four-time Pro Bowl center Frank Ragnow, one of the most important players on a Detroit Lions offensive line that is considered one of the best in the NFL, is calling it a career.

Ragnow wrote on Instagram that he is retiring after seven seasons with the Lions for health reasons.

"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. "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 families (sic) future."

Ragnow, a first-round pick out of Arkansas in 2018, played in 16 games and was a second-team All-Pro selection last season, when he said after the season he felt as healthy as he'd been in years.

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