UPDATE: Steve Manfro suffered a torn ACL.
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UCLA may have lost junior running back Steve Manfro to a serious knee injury. The redshirt junior — who was third on the depth chart behind Paul Perkins and Jordon James — was carted off Spaulding Field on Tuesday afternoon.

“Sometimes, they don’t end up being as serious as they look, but that looked serious to me,” said head coach Jim Mora, adding that it changed the entire mood of practice.

The 5-foot-9 back rushed 107 yards on 24 carries last season, rushing and catching for his only two touchdowns in a 59-13 blowout of New Mexico State. He also returned 18 kickoffs for 446 yards, including a 70-yarder against the Aggies.

However, Manfro only touched the ball twice during Saturday’s 28-20 win at Virginia, losing five yards and a fumble.

Either Nathan Starks and Adarius Pickett, both true freshmen will likely move up as the Bruins’ No. 3 running back. Starks was a four-star recruit who was ranked the third-best 2014 prospect in Colorado, while Pickett was a four-star cornerback who converted to offense in training camp.