The Mets will promote Eric Campbell, Kirk Nieuwenhuis, Kevin Plawecki, and Eric Young Jr. when rosters expand on Tuesday. Steven Matz will also join the club after making one more rehab start. Campbell, Nieuwenhuis, and Plawecki have all spent time on the Mets' active roster this year.

Campbell, who has hit .179/.301/.276 in 187 plate appearances with the Mets this season, was sent down to Triple-A Las Vegas on August 10 to make room for Michael Cuddyer's return from the disabled list.

Nieuwenhuis, who spent some time with the Angels before rejoining the Mets, has hit .188/.261/.356 in the big leagues this year. The highlight of the season came when he hit three home runs against the Diamondbacks just before the All-Star break.

Plawecki made his major league debut in late April, filling in for Travis d'Arnaud. He hit .228/.283/.296 in 227 plate appearances with the Mets before he was optioned to get more playing time once d'Arnaud made his second return from the disabled list.

Young is a familiar name to Mets fans, as he spent much of 2013 and all of 2014 with the team after the Mets traded Collin McHugh to the Rockies for him. He signed with the Braves as a free agent last winter and hit .169/.229/.273 for them before they dealt him back to the Mets for cash. His role on the team down the stretch should be limited to pinch running, though that doesn't necessarily mean that it will be. And he's not on the 40-man roster, which means the Mets will have to remove someone from it to add him to it before he joins the team on Tuesday.