Brown hit the weights and added some muscle mass during offseason workouts, going from 180 pounds to 185.
"I worked on gaining weight and keeping that weight," Brown said.
As an undrafted rookie, Brown, who used to go by the nickname "Philly," made the roster and played in 13 games. He totaled 21 catches for 296 yards and two touchdowns. Though the Panthers added Devin Funchess in this year's draft class, Brown said he's looking forward to producing for his team.
"I can't control who they bring in or what they do," Brown said. "I can only control what I do on the field and leave them no choice but to play me."
Berson nabbed 13 of 20 targets for 151 yards and a touchdown last season, but struggled on special teams, where his muffed punt in a playoff loss to the Cardinals was one of the key plays.
This year, the Panthers have upgraded their talent at wide receiver, meaning Bersin could be the odd man out despite a good rapport with QB Cam Newton.
"Every year you've got to make plays if you want to make the team," Bersin said. "I did it last year in camp and in the preseason. I've got to continue it this year."
Benjamin, who also sustained a hamstring injury during Wednesday's minicamp practice, showed up roughly eight or nine pounds above what the Panthers want him at. Panthers coach Ron Rivera said this could be a factor as to why Benjamin has dealt with injuries this offseason.
“It could be as simple as weight,” Rivera said. “He did come in a little heavy and he had to work himself into shape. Or diet or something. We’re going to take a look at it and make sure it’s not a chronic issue with him. He’s too good a football player to have on the sideline.”
In 2014, Benjamin recorded a franchise rookie record 1,008 yards and nine touchdowns.
Coach Ron Rivera said Wednesday that the team is trying to treat the injury, but he is not overly concerned.
"Too good a player to have on sideline," Rivera said.
Green is expected to miss the entire 2015 season as a result of the injury. He has not appeared in an NFL game since 2012.