The second-year pro has been undergoing treatment for the injury and isn't expected to miss any offseason workouts.
Plantar fasciitis is an inflammation of the tissue on the bottom of the foot rarely requiring surgery, and usually can be controlled with increased stretching, ice, shoe inserts and rest. However, it is a nagging injury that can hinder a player's production if not dealt with properly.
Bears fans will note that Pro Bowl defensive end Julius Peppers played through the injury last season, and Chicago favorite Joakim Noah played through it during a gritty playoff run for the Chicago Bulls.
McClellin is trying to prevent himself from becoming another disappointing Bears first-round draft pick. He appeared in 14 games last season but recorded just seven tackles and 2.5 sacks in limited playing. He also dealt with a knee injury and a concussion during his rookie season.
General manager Phil Emery has said McClellin could play a bit more in a stand-up linebacker role this season -- a position many scouts believed he was better suited for before being drafted.
UPDATE: McClellin told Zach Zaidman of WSCR-670 on Tuesday that the plantar fascitis is "gone".
Follow Kevin Patra on Twitter @kpatra.