Sabres captain Rasmus Dahlin takes leave from team as fiancée recovers from heart transplant

Ruff said there was no timetable for Dahlin's return.

In an open letter to fans in September, Dahlin shared that Matovac had been feeling ill for several days, which led to her experiencing "major heart failure."

"Fortunately, she received CPR on multiple occasions, and up to a couple of hours at a time to keep her alive, which ultimately saved her life. Without her receiving lifesaving CPR, the result would have been unimaginable. It is hard to even think about the worst-case scenario," he wrote.

"Without the incredible commitment, expertise, care, and sensitivity of all the people who treated Carolina, we would not be in the position that we are in today, with Carolina recovering well and on the path to a full recovery."

"While Carolina is still working through her rehab to return to be with me in Buffalo, she has demonstrated an incredible determination, spirit, positivity, and resilience that I am in awe of," Dahlin continued. "This has undoubtedly been the most challenging chapter of our lives, however it is something that we have learned so much from. We will continue to grow from these experiences and are so grateful for all the love and support we have received. We are truly blessed in so many ways and fully realize how fortunate we are."

He has nine points in 14 games this season.

The Associated Press contributed to this report.