Jansen has been out since Aug. 27 when he experienced an irregular heartbeat during a game in Colorado. It was the second such instance for Jansen in the past two years and doctors have decided to perform surgery in the offseason to correct the problem.
But doctors have told Jansen, who has been on blood thinners since the incident, that it is safe for him to return for the final few weeks of this season.
"It's been hard. It's been very frustrating," Jansen said before the Dodgers game against the St. Louis Cardinals on Friday. "But you just have to take care of your health first. It was frustrating, yeah. But now I have to just get my mind back and get that focus to be ready for Tuesday."
Jansen said he will take his last blood-thinning pill Friday night, then switch to Aspirin on Saturday. He hasn't been able to pitch in games since the incident because it's not safe to play while taking blood thinners as any contact can cause internal bleeding. The Dodgers open a three-game series in Washington on Tuesday.
Dodgers manager Don Mattingly said he still thinks of Jansen, 5-3 with a 2.54 ERA, 25 saves and 86 strikeouts in 56 2/3 innings this season, as his closer but likely will ease him back into the role.
League has not allowed a run in his past 12 appearances since Aug. 21. He's 1-0 with two saves in that span. Belisario has not allowed an earned run in his last 13 appearances since Aug. 17. He picked up a save Aug. 29 in Colorado.
"Brandon has thrown the ball really well and I'd probably feel more comfortable if I get (Jansen) into a game and get him out there without having to put the whole game on him after being out a while," Mattingly said. "So we'll probably get him comfortable one time and go from there."