The Carolina Panthers signed two additions to bolster depth on the offensive line as players reported for training camp on Thursday.

Added were center/guard Fernando Velasco and center Kevin Matthews. Velasco started 11 games at center for Pittsburgh last season before suffering an Achilles injury.

Matthews, the son of Hall of Fame lineman Bruce Matthews, spent last season on the practice squads of Tennessee and Washington.

To make room on the roster the Panthers released undrafted free agent center Jared Wheeler and linebacker Billy Boyko, who was cut after failing to disclose a physical condition.

The offensive line arguably is the greatest question mark for Carolina as it enters camp with center Ryan Kalil the only player who started at the end of last season returning to the same position.