Benjamin was carted off the practice field earlier in the day after sustaining an apparent left knee injury.
Panthers coach Ron Rivera told reporters after practice that Benjamin had sprained his knee and that he would have an MRI.
Benjamin appeared to injure himself while running during a one-on-one drill with Dolphins corner Reshad Jones. He fell to the ground clutching his left leg, and put no weight on it as he made his way off the field, according to Jonathan Jones of The Charlotte Observer.
Benjamin posted a message on his Instagram page after receiving the diagnosis.
The Panthers selected Benjamin in the first round of the 2014 NFL draft. In his rookie year with Carolina, Benjamin played in all 16 games and started 15. He logged 1,008 yards on 73 receptions and scored nine touchdowns.
- Erin Flynn