Nick Fairley’s shortcomings in the offseason haven’t escaped Lions general manager Martin Mayhew.

“As I’ve told him, I’d like to see his commitment to the offseason program improve and see him on a consistent basis. It’s voluntary but if he’s not training with us I’d like to see him training somewhere,’’ Mayhew said on Friday.

The general manager said he wasn’t singling Fairley out, he was just answering a question.

“There are a handful of guys who can do a better job with that. I think that’s an important part of being a professional athlete,’’ Mayhew said.

Fairley, a first-round pick in 2011, will be in the fourth year of his rookie contract in 2014. Per the collective bargaining agreement, the team must decide whether to exercise the fifth-year contract option on first-round picks before May 3.

Mayhew said it’s been discussed but there is nothing he can disclose at this time.

“I’ve talked with him and his agent,’’ Mayhew said. “We talk on a regular basis.’’

Fairley is not the only defensive tackle with a contract issue. The Lions are trying to sign Ndamukong Suh to an extension but he hasn’t hired an agent after firing his long-time agents several weeks ago.

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