"From our perspective, the captain is your heartbeat of your team," Adams said. "And we are in a situation where we felt we needed to make that decision."
Eichel, who's been the focus of trade rumors throughout the 2021 NHL offseason, and the Sabres have been at odds about the treatment he should receive.
Eichel preferred to have an artificial disc replacement surgery, which hadn't ever been performed on an NHL player before. The Sabres, however, disagreed with the recommendation of Eichel's neurosurgeon and withheld their approval for the procedure in favor of a fusion surgery.
The 24-year-old center was limited to 21 games in 2020-21 as a herniated disc ended his season in April.
Because of the delay in making a final decision, his availability for the start of the 2021-22 season was thrown into doubt.
The saga led many to feel a separation was inevitable.
Prior to the herniated disc, the 2015 first-round pick had been playing the best hockey of his career. He posted 160 points (64 goals, 96 assists) in 145 games between 2018-20 and had two goals and 16 assists through 21 appearances last season.