Mets pitcher Colin Holderman looks at the Phillies runner on...

Mets pitcher Colin Holderman looks at the Phillies runner on first base during the seventh inning at Citi Field on May 28. Credit: Kathleen Malone-Van Dyke

The Mets made several roster moves on their off day Monday, including sending reliever Colin Holderman to the minors and claiming infielder Kramer Robertson off waivers from Atlanta.

They also moved righthander Tylor Megill to the 60-day injured list. He was unlikely to return from the strain in his right shoulder before mid-August anyway, so this created room on the 40-man roster for Robertson.

Holderman had been establishing himself as one of the Mets' more reliable bullpen arms in his first taste of major-league action until suffering a right shoulder impingement earlier this month. He had a 3.18 ERA and 1.24 WHIP in 10 appearances. Officially, he was activated from the injured list and demoted in this batch of changes.

The Mets assigned Robertson, 27, to Syracuse. He made his major-league debut with the Cardinals in May, was claimed by Atlanta in early June and has a .242/.397/.385 slash line in Triple-A this year. 

None of these transactions impacted the Mets' active roster.