Jeffery is expected to return to Halas Hall for the Bears' mandatory veteran minicamp that runs June 14-16, if not sooner, per the source.
Jeffery’s absence, however, was not unexpected. The former Pro Bowl receiver informed the team ahead of time he intended to train at a complex in South Florida, according to the source.
Jeffery is determined to fix the soft tissue injuries that forced him to miss seven games in 2015.
Jeffery is scheduled to play under the franchise tag next season. The wideout signed his tender -- worth $14.599 million -- in early March. The sides have until July 15 to agree to terms on a long-term contract.
The former second-round pick appeared in just nine games last season because of a variety of health setbacks that began in training camp, when he suffered a serious calf strain in a closed walk-through practice prior to Chicago's preseason opener. Jeffery missed all four exhibitions. His season was shut down in December with a hamstring injury.
When healthy, Jeffery is one of the Bears' top players on offense, catching 54 passes for 807 yards and four touchdowns last season. He tied a franchise record with three straight 100-yard receiving games, against Detroit, Minnesota and San Diego.
Jeffery has a dozen 100-yard receiving games in his four seasons with the Bears, tied for fifth-most in franchise history. He set career highs with 89 catches for 1,421 yards in 2013. He also hauled in 10 touchdowns in 2014.