Lions coach Dan Campbell brought up how the Saints successfully replaced a retiring Pro Bowl C during his time there for Detroit to replace Ragnow

In the wake of Ragnow's retirement, veteran Graham Glasgow and rookie Tate Ratledge, whom the Lions drafted in the second round in April's draft, have been taking reps at center at the team's OTAs. Whichever player takes over the starting job will have big shoes to fill.

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.