Detroit Lions center Frank Ragnow is retiring after seven seasons in the NFL. Ragnow, 29, announced his decision in an Instagram post Monday, and he cited his future health as the primary reason.

ALLEN PARK, Mich. — The Detroit Lions have added depth on their depleted offensive line, signing veteran Trystan Colon. Detroit waived/injured cornerback Divaad Wilson on Wednesday to clear a roster spot. The Lions lost their starting center to retirement earlier this week.

The Detroit Lions are signing a former Arizona Cardinals offensive lineman to a one-year deal to reinforce the interior of their offensive line as they figure out how to move forward following Frank Ragnow's retirement.