According to information from journalist Darren Dreger, several teams are in advanced discussions with the Sabres about their star forward. The Rangers, the Wild, the Ducks and the Kings would be among them, while the Montreal Canadiens option is not to be ruled out either.
The CH is a special case in this matter. Having just reached the Stanley Cup final, there is very little chance that Marc Bergevin will decide to empty his team to acquire Eichel. On the other hand, players like Nick Suzuki and Cole Caufield, who would certainly be in the Sabres' demands, are most likely considered untouchables by the Habs' GM.
The young Finnish Jesperi Kotkaniemi, on the other hand, would not benefit from this status, even if he is still very appreciated within the organization. However, according to TSN's Dan Kramer, there would be very little chance that an offer built around Kotkaniemi would fully meet the Sabres' expectations, especially considering the returns that could be offered by the other teams mentioned above.
In conclusion, even if the finalization of such a personnel move remains very unlikely, it is more than satisfying to see that Marc Bergevin is involved in this matter, in addition to being mentioned among the rumors for other big names such as Dougie Hamilton, to name only one.