Kirby was traded from the Brewers to the Pirates on Sunday in exchange for Kevin Kramer, Jake Crouse of MLB.com reports.

Kirby made his first appearance since September of 2018 on Thursday, Tom Haudricourt of the Milwaukee Journal Sentinel reports.

Kirby (neck/rib) is throwing live batting practice sessions, the Milwaukee Journal Sentinel reports.

Kirby (neck) is dealing with a stress fracture in his second rib, Todd Rosiak of the Milwaukee Journal Sentinel reports.

Kirby underwent surgery for thoracic outlet syndrome in late April, Todd Rosiak of the Milwaukee Journal Sentinel reports.

Kirby is pitching without restriction this spring, Todd Rosiak of the Milwaukee Journal Sentinel reports.

Kirby (elbow) has resumed pitching in instructional league games, according to Josh Norris of Baseball America.

Kirby will undergo ulnar nerve transposition surgery Tuesday and is expected to be sidelined for eight-to-12 weeks, Tom Haudricourt of the Milwaukee Journal Sentinel reports.

Kirby (elbow) will be held back in extended spring training before being assigned to an affiliate, MLB.com's Adam McCalvy reports.

Kirby (elbow) pitched in a game Monday for the first time since undergoing Tommy John surgery in 2015, MLB.com's Adam McCalvy reports.