Green Bay Packers linebacker Clay Matthews had a little maintenance done once the regular season ended.

According to Rob Demovsky of ESPN, Matthews recently had a “clean-up” surgery completed on his knee.

The 31-year-old linebacker missed two games and was questionable for two others in 2017 because of groin and hamstring injuries, but he was never on the injury report for a knee injury.

Matthews finished with 7.5 sacks in 2017, his most since 2014. He tallied 5.0 sacks during an injury-plagued season the year prior.

His future in Green Bay remains uncertain. While Matthews will account for over $11 million on the Packers’ salary cap in the final year of his contract in 2018, the team could save every penny – with no cap penalty – by releasing him.

However, if the Packers believe he’s healthy, there’s no reason to believe he wouldn’t be back. Green Bay is short on difference makers on defense, and Matthews could be a versatile and valuable chess piece for the next defensive coordinator.

It’s possible a restructured deal could make sense for both sides. Matthews might be willing to sacrifice if the Packers are willing to offer guaranteed dollars in 2018 or beyond.

A first-round pick of the Packers in 2009, Matthews has delivered 80.0 sacks – a franchise record – over his nine NFL seasons.