Cade Horton Injury: Throwing bullpen Sunday

Horton (ribs) will throw a bullpen session Sunday, Jesse Rogers of ESPN.com reports.

Horton left his last appearance with back tightness, and an MRI revealed areas of concern in his rib area. Still, the Cubs plan on starting Horton in the NL Wild Card series against San Diego next week, likely in Game 1. Horton's scheduled bullpen session indicates the 24-year-old remains on schedule.