Howard Johnson (hitting coach), Dan Warthen (pitching coach), Sandy Alomar Sr. (bench coach) and Sandy Alomar Jr. (catching instructor) will return. The first-base slot remains open.
The Mets said Thursday they are reassigning bullpen coach Guy Conti, third-base coach Luis Aguayo and first-base coach Ken Oberkfell. Conti had been bullpen coach for four seasons.
Niemann is entering his 22nd year with the Mets and was bullpen coach from 1997 to mid-1999 and 2000-02. He spent the past two years as minor league rehabilitation coordinator.
Shines had been manager of the Philadelphia Phillies' Clearwater farm team, leading it to a 64-76 record in the Class A Florida State League. He was third-base coach of the Chicago White Sox in 2007.
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