Charles Matthews tore his ACL during a pre-draft workout with the Boston Celtics, according to Jonathan Givony of ESPN.

Matthews was ranked #60 in ESPN's top 100 draft prospects and was considered one of the top defenders in the draft.

"Injuries are tough, but Charles is an extremely hard worker and will be back stronger than ever. He had a series of outstanding workouts lately and has helped himself. Charles will continue that momentum when he returns to action," said his agent Adam Pensack.