Benjamin was carted off the field after suffering the injury while making a routine cut. He was taken to Charlotte, North Carolina for an MRI, which revealed the tear. The 6-foot-5 receiver caught 73 passes for 1,008 yards and nine touchdowns in 2014, making him the team's number one receiver.
Carolina selected Benjamin with the 28th overall pick in the 2014 draft. Rookie Devin Funchess is expected to take over the number one spot on the depth chart. The 6-foot-4, 225-pound receiver was selected in the second round out of Michigan.
Benjamin's replacement suffered a hamstring injury late in Wednesday's practice, and his availability for Thursday's joint practice is in doubt.
Panthers GM David Gettleman expressed his sympathy for Benjamin, but has no doubt that he will attack rehab and come back at 100 percent.