Report: Cowboys Pro Bowl guard Martin suffers hyperextended knee, set for MRI

Dallas Cowboys guard Zack Martin reportedly suffered a hyperextended left knee in Saturday's preseason contest against the Cincinnati Bengals, a source told ESPN's Todd Archer. Martin will undergo an MRI on Sunday.

Cowboys owner Jerry Jones spoke to reporters following the game and said the team is optimistic that Martin's injury isn't serious, via David Helman of DallasCowboys.com.

Jones added that he doesn't think Martin's injury is "problematic," according to Charean Williams of ProFootballTalk.

During the second quarter, Martin headed to the medical tent after getting hit low while making a block upfield. He was later seen on the sideline in street clothes speaking with teammates.

Martin, one of the NFL's premier guards, has been named to the Pro Bowl in each of his four seasons. He's also earned two first-team All-Pro (2014, 2016) and two second-team All-Pro (2015, 2017) selections.

The 27-year-old hasn't missed a start in his professional career.