Contreras will be Jon Lester's personal catcher this season, Patrick Mooney of CSN Chicago reports.
The news comes as no surprise, as Contreras was already expected to be the everyday catcher for the Cubs moving forward. The 24-year-old hit .282/.357/.488 in his rookie season and will have a chance to improve on those numbers with more consistent playing time. David Ross, who served as Lester's battery mate the past two seasons, will help coach Contreras in spring training, according to manager Joe Maddon.