ALLEN PARK, Mich. — Detroit Lions general manager Martin Mayhew says this offseason will probably be his most challenging since he started making football decisions for the franchise.

Mayhew met with reporters Thursday, less than a week after Detroit's season ended with a loss at New Orleans in an NFC wild-card game.

His hopes to sign All-Pro receiver Calvin Johnson and coach Jim Schwartz to contract extensions. He also wants to re-sign offensive tackle Jeff Backus, defensive end Cliff Avril, linebacker Stephen Tulloch and backup quarterback Shaun Hill.

The Lions won 10 games in Mayhew's third full season after winning eight games combined the previous two years.

Mayhew was promoted to replace Matt Millen during the 2008 season when Detroit went on to become the NFL's first 0-16 team.