The New York Mets placed outfielder Michael Conforto on the 7-day concussion injured list Friday, while outfielder Keon Broxton was designated for assignment.
Veteran outfielder Carlos Gomez's contract was selected from Triple-A Syracuse, and right-hander Paul Sewald was recalled from Syracuse.
Conforto was injured in Thursday afternoon's game at Washington, when he crashed into the shoulder of second baseman Robinson Cano while chasing a popup and then hit the ground with a thud. He was immediately removed from the game and returned to New York for further examination.
Conforto, 26, is batting .271 with nine home runs and 21 RBIs in 42 games for the Mets this season. Broxton struggled in his first season with the Mets, batting .143 with just one extra-base hit in 49 at-bats over 34 games.
Gomez was batting .270 with six home runs and 22 RBIs for Syracuse. The 13th-year veteran is a .253 career hitter in the major leagues with 142 home runs and 536 RBIs and was a two-time National League All-Star with the Milwaukee Brewers in 2013 and 2014.
Sewald has made just three appearances with the Mets this season after 103 appearances in the previous two seasons. He was 2-1 with a 2.50 ERA in 12 appearances at Syracuse.