Gardner Minshew II has taken several low hits by defenders in recent games with no penalty flags -- despite a league rule that prohibits such contact.

Jaguars coach Doug Marrone expressed concern Monday that several low hits on quarterback Gardner Minshew II in the last two games haven’t been flagged for roughing the passer.

Minshew sustained a slight injury to his left knee against Denver on Sept. 29 when he was hit low by linebacker Todd Davis, without a penalty being called. Since then, Minshew has worn a brace on the knee in practice and in Sunday's game against Carolina, which the Jags lost 34-27.

Bradley Chubb also got an unflagged hit on Minshew, and Von Miller got a roughing the passer penalty on the Jags’ final possession that led to Josh Lambo’s winning field goal.

Both Chubb and Miller were fined by the NFL last week for those hits.

Then against Carolina on Sunday, Minshew was hit low again by rookie defensive end Brian Burns. Minshew got up looked at the nearest official, pointing at Burns, but the play wasn’t flagged.

According to the NFL rulebook, “a rushing defender is prohibited from forcibly hitting in the knee area or below a passer who has one or both feet on the ground, even if the initial contact is above the knee.”

Minshew has drawn roughing the passer penalties three times this season, once each against Denver, Tennessee and Carolina. All three have come on late, but high, hits.

"I would hope that everyone’s doing what they’re supposed to do and those are penalties for hitting him low," Marrone said, choosing his words with care. "I think you get concerned when things are happening to your team that aren’t getting called."

Marrone said his only option is to send video of the plays in question to the league office. Coaches and players are subject to fines if they complain about officiating.

"Obviously, those things ... We have the ability to turn them in, make people aware of it prior to [a game]," he said. "But ... during the course of the game, you like to see that stuff get called and make sure that player safety is the number one thing that we harp on and we talk about. So, that’s the one thing that we should be doing well.”