Kilian is expected to join the Cubs' rotation for good at some point this summer, Sahadev Sharma and Patrick Mooney of The Athletic report.
His surface numbers at Triple-A Iowa are excellent, but his 10.1 BB% is a career-worst mark and he only recently started touching the upper-90s with his fastball, which is where that pitch was touching last year in the Arizona Fall League. Kilian has a 1.57 ERA, 1.22 WHIP and career-best 60.8 GB% through seven starts.