Plawecki was batting seventh against Atlanta on Tuesday night. New York entered with an eight-game winning streak.
The Mets promoted Plawecki and right-handed reliever Hansel Robles, both 24, from Triple-A Las Vegas after catcher Travis d'Arnaud and lefty reliever Jerry Blevins were injured Sunday.
D'Arnaud will be out more than three weeks because a broken right little finger after he was hit by a pitch. Blevins miss at least six weeks after a line drive broke his left forearm.
Plawecki is highly regarded by the Mets. He was drafted in 2012 with a compensation pick the Mets got for losing Jose Reyes to free agency. Plawecki said he went to dinner with d'Arnaud on Monday night.
"He just told me that I was ready," Plawecki said.
"You bring a prospect to the big leagues, they play," Collins said.
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