Kelly is scheduled to start Sunday's game against the White Sox in what's expected to be a bullpen day.
Unless they bring aboard another pitcher from Triple-A Worcester to serve as a bulk reliever, the Red Sox look set to lean on a number of arms for the series finale in Chicago once Kelly exits the game. Kelly recorded one out in Saturday's 6-1 loss and hasn't exceeded three innings in any of his 20 appearances this season between the majors and Triple-A, so he shouldn't be expected to work more than once through the batting order in his first big-league start. Brennan Bernardino, Justin Slaten and Cam Booser are all available on at least two days' rest and should all be capable of giving the Red Sox two or more innings out of the bullpen, if needed.