Along with Roenis Elias being sent back to Triple-A Pawtucket, outfielder Rusney Castillo was also sent down and infielder Deven Marrero and outfielder Ryan LaMarre were called up to take their spots on the Red Sox roster.
Marrero and LaMarre arrived at Fenway two hours before the Red Sox played the Mariners on Saturday afternoon.
“They give us some versatility, some flexibility inside a given game," manager John Farrell told reporters.
Marrero, 25, played 25 games for Boston last season and was hitting .216 this season for the PawSox. LaMarre, 27, played 21 games for the Cincinnati Reds last season and was hitting .313 with six homers and 11 stolen bases for Pawtucket.
Castillo, 28, the Cuban outfielder signed to a 7-year, $72 million deal in 2014, was 2-for-8 in his most recent nine-game stint with Boston. Elias, 27, allowed seven runs in four innings in an 8-4 loss to the Mariners on Friday in his disastrous Red Sox starting debut.