More help for new defensive coordinator Mike Pettine and filling a void or two on offense figure to be targets of the Buffalo Bills when the free-agent shopping season begins Tuesday.

The Bills could use help at linebacker and safety for a defense that ranked 31st against the run and 26th in points allowed.

Aside from a quarterback of the future, the Bills’ prime offensive needs are at receiver, tight end and guard.

“We will try to be active in free agency,” said Bills General Manager Buddy Nix. “I don’t know how that’ll work out. We’re not going to go crazy and overspend and get ourselves in a bind where we can’t keep some of our own, but we will be a player. We’ll attempt to make moves in free agency to plug some holes.”

The free agency signing period begins at 4 p.m. Tuesday. The Bills got a jump on the signing derby Saturday by reaching agreement on a deal to keep cornerback and kick returner Leodis McKelvin for four more years.