Montee Ball injury will keep him out a month; Broncos try out Leshoure, Stephens-Howling

The Denver Broncos tried out a couple of running backs Tuesday, but neither signed contracts, meaning the Broncos will roll with the likes of Ronnie Hillman, C.J. Anderson, and Juwan Thompson at running back.

What's more, Montee Ball's injury situation continues to be fluid. On Monday, ESPN estimated that Ball could miss up to three weeks; on Tuesday, the Denver Post reported that Ball's MRI revealed "a significant groin strain" that could leave him sidelined a month or more.

The free agent backs the Broncos tried out Tuesday were 2011 Detroit Lions second-round draft pick Mikel Leshoure and 2009 Arizona Cardinals seventh round draft pick LaRod Stephens-Howling, according to the Post. Both left Dove Valley without contract.

In Ball's second half absence Sunday, Hillman rushed 15 times for 64 yards. Thompson rushed three times for 15 yards and a touchdown; Anderson was inactive. It is expected that all three will rotate carries in practice as the Broncos try to find a rotation that works.

Nothing is set in stone as far as Denver's running back rotation goes.

Hometown Bronco released

From their practice squad, the Broncos released OT Ryan Miller of Colorado Buffaloes and Columbine High School fame, Mike Klis reports.  No corresponding practice squad move has been announced.