NEW YORK -- The New York Mets announced that catcher Kevin Plawecki, infielder Eric Campbell and outfielders Eric Young Jr. and Kirk Nieuwenhuis will join the team on Tuesday from Triple-A Las Vegas when major league rosters expand.

Plawecki was demoted on Aug. 12 when it was determined that Travis d'Arnaud had enough time back after a DL stint to be capable of playing regularly.

The ex-Met Young was reacquired from the Atlanta Braves on Aug. 22 for cash. He primarily will serve as a pinch runner. He was playing at Triple-A Gwinnett at the time of his acquisition.

Campbell is hitting .179 with three homers and 19 RBIs in 156 at-bats at the major league level this season.

Nieuwenhuis officially was on a rehab assignment with Las Vegas for a pinched nerve in his upper back.

The Mets also have Steven Matz, Bobby Parnell, Erik Goeddel and Lucas Duda on the DL. All of those players, with the exception of Duda, are expected to be activated as soon as Tuesday. Duda (back) has yet to resume swinging a bat.

Left-handed reliever Dario Alvarez also figures to rejoin the Mets soon. However, he will not be eligible to be promoted until Thursday because he has not spent the required 10 days in the minors since a demotion. Freshly demoted Logan Verrett also must wait 10 days to return.

The addition of Young and the return of Goeddel from the 60-day DL will require opening a pair of spots on the 40-man roster.