The Facts: Darnold had a rough second season physically, so rough that he needed surgery this week. Darnold underwent a procedure Tuesday to repair a ligament in his left thumb, according to sources.

Diehards Line: The procedure was performed by the Jets team doctors, and he is not expected to miss any time this offseason, sources told Post staffer Brian Costello. ... Darnold dealt with the thumb injury for the final two months of the season. Darnold took a pounding this year behind an injury-plagued offensive line. At various times he had injuries to his thumb, knee and ribs. He also missed three games after being diagnosed with mononucleosis in September. The 22-year-old played 13 games, going 7-6. He completed 61.9 percent of his passes for 3,024 yards, 19 touchdowns with 13 interceptions. He had a QB rating of 84.3. Darnold played much better in the final two months of the season after struggling for a stretch in October when he returned from mono. Darnold typically takes a few weeks off and then begins working with his private quarterback coach Jordan Palmer in California. Since the surgery was on his non-throwing hand, he should still be able to do his normal work. He cannot work with Jets coaches again until April when the collective bargaining agreement allows the team to begin its offseason workouts.