O'Brien was optioned to Triple-A Omaha on Monday, Rustin Dodd of The Kansas City Star reports.

EDGE Analysis

O'Brien is slashing .294/.362/.765 with a team-leading seven homers and 14 RBI over 51 at-bats this spring, but he was never considered too serious of a candidate to crack the Opening Day roster. Even with Jorge Soler expected to hit the DL to begin the season, O'Brien's lack of a defensive home -- along with his struggles to make contact (team-leading 19 strikeouts) -- ultimately kept him off the 25-man.