Best was placed on season-ending injured reserve in November after he couldn't shake the lingering effects from a concussion he sustained Oct. 16 against the San Francisco 49ers. Leshoure, the team's second-round pick who was expected to compliment Best, missed the entire season after tearing his Achilles' tendon during training camp.
"Both are tracking on a pace to be ready for offseason drills," Lewand said.
Despite concerns about his future after his third career concussion, Best has maintained he would "definitely" return next season.
"We can't put all of our eggs in the basket of guys coming off injury," he added.