The Philadelphia Phillies plan to announce Monday that assistant general manager Ruben Amaro has been promoted to replace departing GM Pat Gillick.
A press conference is scheduled for Monday at 10 a.m. ET.
Amaro, 43, has played an active role in contract talks and personnel decisions as an assistant GM with the Phillies for 10 years under Ed Wade and Gillick.
Amaro, a Stanford University graduate, spent eight seasons in the major leagues as an outfielder with the California Angels, Cleveland Indians and the Phillies before retiring as a player in 1998 and moving into the Philadelphia front office.
The Philadelphia Inquirer reported during the World Series that Amaro was expected to replace Gillick. The Phillies' choice came down to two internal candidates -- Amaro and Mike Arbuckle, the team's assistant GM for scouting and player development.
Arbuckle, 58, is widely respected within baseball circles as a talent evaluator. He was responsible for drafting Chase Utley, Jimmy Rollins, Ryan Howard, Pat Burrell and several other mainstays on Philadelphia's 2008 world championship club.
Arbuckle received word of the Phillies' decision after the team's World Series victory over Tampa Bay, and told club president Dave Montgomery that he will be leaving the organization to pursue other opportunities, a source confirmed.
The Philadelphia Daily News first reported the Friday meeting between Montgomery and Arbuckle.
Arbuckle declined comment when reached by ESPN.com.
The Phillies wanted to make the transition from Gillick to Amaro official before the start of the baseball general managers' meetings, which begin Monday in Dana Point, Calif.
Jerry Crasnick covers Major League Baseball for ESPN.com.