Clemson offensive lineman Brandon Thomas tore his anterior cruciate ligament during a private workout last week with the New Orleans Saints, according to a league source.

Thomas will undergo surgery soon to repair the damage following a serious knee injury a month out from the NFL draft.

Thomas excelled during the Senior Bowl, drawing praise from NFL scouts at his technique and aggressiveness as he finished off blocks and displayed a nasty streak.

Thomas was drawing second-round and third-round grades from draft analysts prior to the injury and was regarded as a rising draft prospect.

Thomas is still expected to do well in the draft, but obviously the timing of the injury will affect his draft stock.

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Aaron Wilson covers the Ravens for The Baltimore Sun