The Red Sox selected Gonsalves' contract from Triple-A Worcester prior to Tuesday's game against the Rays.
A COVID-19 outbreak has ravaged Boston's roster, the bullpen in particular, so Gonsalves joins the team as much-needed pitching depth. The lefty went three innings as recently as Aug. 19, so he could prove useful in a mop-up role Tuesday, assuming newcomer Brad Peacock doesn't provide much length on short rest. Gonsalves' only big-league action came in 2018 when he had a 6.57 ERA in 24.2 innings with Minnesota.