Guerra, who started the year as the team's closer, was sent down in August to work on his control. He was recently called back up when rosters were expanded. He is 2-3 with a 2.60 ERA in 45 games and he has not allowed a run in his last 10 outings.
With Jansen out because of a recurrence of an irregular heartbeat, manager Don Mattingly said he planned to use Guerra in more extended appearances like Jamey Wright has done all season, with Wright making more late-game, higher-pressure appearances. Mattingly said Guerra hurt himself warming up before making a one-inning appearance on Sunday.
In Wall, Mattingly said the team gets more of a power arm who can go about an inning at a time.
Wall, who was optioned on Aug. 30, is 1-0 with an 11.57 ERA in three appearances through two stints with the Dodgers this season.