Standing on the sideline at Michigan's pro day last week, San Francisco 49ers general manager John Lynch and Pittsburgh Steelers coach Mike Tomlin shared a laugh when Tomlin brought up Niners wide receiver Brandon Aiyuk.

Speculation about Aiyuk's future with the team has persisted for more than a year and reached a crescendo this offseason as Aiyuk prepares for the final year on his rookie contract. That includes rumored trades all over the NFL map, including to Tomlin's Steelers.