Oakland Raiders running back Marshawn Lynch is dealing with a groin strain that could affect him long term, according to Vic Tafur of The Athletic.
Head coach Jon Gruden is reportedly "concerned" about the injury, which will be examined this week when the Raiders have their bye.
While the 32-year-old has been limited in practice this year with shoulder, abdomen and hip injuries, he hasn't been forced to miss any games.
A significant ailment could lead to the first missed time due to injury since he was limited to seven games with the Seattle Seahawks in 2015 because of a hamstring ailment and sports hernia that required surgery.