Adam Schefter of ESPN reported that Lacy's hamstring injury will keep him out, and no makeup date has been announced:
Lacy is considered to be one of the best running backs in a draft that appears to be bereft of high-quality players at the position. His 140 yards and one touchdown against the Notre Dame Fighting Irish in the BCS National Championship highlighted what was a very strong 2012 for the running back.
In that game Lacy was able to fend off tacklers quite easily and probably could have run for 200-plus yards had the score been closer.
That performance catapulted him into the national consciousness. It likely played a large part in his decision to forgo his final season at Alabama and enter the draft.
While he was able to answer questions at the combine, Lacy did not partake in any physical tests because of a hamstring tear he suffered in training (h/t Andrew Gribble of AL.com). As Gribble also noted, Lacy came into the combine at 231 pounds, which was 11 pounds over what the Crimson Tide listed the running back during his junior season.
This is not the kind of momentum that Lacy would want to be building prior to 2013 NFL draft. Any team would be hard pressed to spend a first-round draft pick on somebody who isn't able to work out. While there's plenty of game film for Lacy, it would be helpful for him to be able to show off his skills prior to draft day.