Lions cornerback Jeff Okudah slowly limped off the field in the second half of Detroit’s season-opening loss to the San Francisco 49ers after being injured on a play. While nothing is definitive just yet, it’s not sounding good for the second-year CB.

In his postgame press conference, Lions head coach Dan Campbell indicated that Okudah is being evaluated for a possible Achilles injury. Okudah will have an MRI on Monday at the team’s facility to determine the exact injury.

It’s a rough blow for the Lions and for Okudah, who played his rookie season while dealing with a core muscle injury that limited his mobility. Okudah is the Lions top starter at CB and the team is incredibly young and inexperienced in the secondary.