Guerra passed another test Monday night, rebounding from his first blown save to lock down his 11th save.
"To me, everything says he can [be the closer next year]," manager Don Mattingly said. "Start with the stuff, 95 [mph fastball] and a 91 [mph] cutter. A curveball he throws for strikes, and he doesn't seem to get rattled. With Kenley and Javy, we have two legitimate late-inning guys.
"There is something about the ninth inning, I've seen it over the years. You can't really explain it. But there's something different about that inning. He makes it kind of simple. He's got good stuff and he's not afraid."
Jansen was scheduled to finish up a Minor League rehab assignment Tuesday night for Class A Rancho Cucamonga. The right-hander is on track to be activated Friday night after recovering from an irregular heartbeat.