Someone has to run the ball behind Alex Collins and Jonathan Williams. At least on occasion.

Last year’s third running back, Korliss Marshall, averaged 4.8 yards per carry last season and proved explosive as a kick returner, but got booted from the program due to disciplinary issues.

Now, the player who seemed like Arkansas’ third running back for 2015 has torn his ACL.

Juan Day, a redshirt freshman, spent last year developing on the scout team and was set to make his Razorbacks debut this September. The team would’ve loved to see him in action this fall to gauge whether he can become the lead guy in the backfield once Collins and Williams depart, but his latest injury casts major doubt on the possibility Day will see the field in ’15.

The Little Rock, Ark., native tore the ACL in his opposite knee in ’13, forcing him to miss most of his senior season in high school.

Arkansas should be fine at the position this year — both Collins and Williams ran for more than 1,000 yards last season and the team returns four starters on a talented offensive line — but losing both Marshall and Day in the last several months is a noticeable paper cut.

The other scholarship running back options currently with the team are redshirt sophomore Denzell Evans, who mostly caught passes out of the backfield in very limited time in ’14, and Connor McPherson, a 5-foot-7, 207-pound redshirt freshman.

More than before, the Hogs need to keep their two lead backs healthy.