Alabama Football Spring Practice Day 1

Alabama running back Bo Scarbrough (9) works through drills during Alabama's first spring football practice, Friday, Mar. 13, 2015, at the Thomas-Drew Practice Fields in Tuscaloosa, Ala. Vasha Hunt/vhunt@al.com ORG XMIT: ALBIN401

(VASHA HUNT)

Alabama freshman running back Bo Scarbrough suffered a knee injury near the end of the Tide's scrimmage Friday afternoon, coach Nick Saban announced.

Saban was unsure of the extent of the injury immediately following the scrimmage.

"You've got to take MRIs and do all those things, so I don't speculate on these kind of injuries," Saban said. "We'll see, and we'll let you know when we find out."

A prized member of last year's recruiting class, the versatile 6-foot-2, 240-pound Scarbrough was expected to factor into Alabama's offense this season.

Scarbrough ran a 4.53 in the 40-yard dash, bench pressed 405 pounds and and recorded the best broad jump on the team at 10-feet, six inches during the Tide's spring testing, according to a source.

Scarbrough ran for 36 yards on 16 carries Friday prior to getting hurt.

The injury further depletes a once deep unit. Altee Tenpenny transferred following last season. Tyren Jones was suspended indefinitely and later dismissed. Now, Scarbrough's status is uncertain following the injury.

Derrick Henry and Kenyan Drake are the only two running backs on the Tide's roster that carried the ball more than twice last season.

Three of the four healthy running backs on Alabama's spring roster are walk-ons. The other -- DeSherrius Flowers -- is a true freshman.

Five-star running back Damien Harris will arrive during the summer.

"Bo was doing pretty well," Saban said Friday. "But we've had a lot of injuries, suspensions, and lost some people at that position. So what seemed like a pretty strong position depth-wise has gotten a little thin."