LOS ANGELES -- For precautionary reasons, Dodgers closer Kenley Jansen might miss this week's series in Colorado, where he showed symptoms of an irregular heartbeat less than a month ago.Jansen said his status is uncertain, as the club and medical professionals are debating the risks of returning him to the

LOS ANGELES -- For precautionary reasons, Dodgers closer Kenley Jansen might miss this week's series in Colorado, where he showed symptoms of an irregular heartbeat less than a month ago.

Jansen said his status is uncertain, as the club and medical professionals are debating the risks of returning him to the Mile High City, where Jansen also had an irregular heartbeat in 2012, leading to offseason ablation surgery. He expects to have another procedure this winter.

"It's being debated," Jansen said. "It's tough."

The Dodgers have a three-game series in Denver this Friday through Sunday, then visit the Reds for three games and the Cardinals for four. If Jansen skips Colorado, he would meet the team in Cincinnati.

"With Kenley and altitude and going to Denver, it's certainly going to be a conversation we're going to revisit during this series," manager Dave Roberts said on Monday. "The No. 1 priority that we're all aligned on is that Kenley's health is first and foremost the priority. If there's any hesitation on his part or the doctors say the altitude can affect him in any way, then for us, it's a no-brainer to have him stay back. So we haven't made a decision yet. We'll have those conversations and make that decision in the next couple of days."

With expanded rosters and the acquisition of Ryan Madson , the Dodgers are better equipped to withstand Jansen's absence than last month. They are also targeting the Rockies series for the return of All-Star Thomas Stripling to the bullpen, providing added depth.

After experiencing atrial fibrillation in Denver, Jansen spent 10 days on the disabled list. He returned on medication and experienced the worst four-game stretch of his career before rebounding off the medication to collect two saves and a win in the last three games against Arizona.

Jansen said he doesn't fear for his health by returning to Denver, but is concerned about handicapping the club should he suffer another episode and require another lengthy stay on the bench while the team is in a pennant race.

X-rays negative on Buehler

X-rays were negative on the left foot of Sunday's starter, Walker Buehler , who said he expects to make his next start. Buehler was charged with one run on two hits in 6 1/3 innings in a 3-2 win, but Roberts said he was unaware of any physical issue until after the game.

"Everything was fine," Buehler said. "It was precautionary. A little muscle in my foot spasmed. It's not really a big deal. The fifth inning, it kind of tightened up on me, but it feels way better today. It loosened up about an hour after the game. We just wanted to make sure, with the history of the rib stuff, that we didn't miss anything."

Buehler missed nearly a month earlier this season with a microfractured rib that didn't show up on the original X-ray.