The younger Nylander brother won't begin the season in the NHL.
Alexander Nylander was among four players assigned by the Buffalo Sabres to the AHL's Rochester Americans, the club announced while finalizing its roster Tuesday.
The Sabres selected the 18-year-old forward eighth overall in June's draft.
He notched 75 points in 57 regular-season games for the OHL's Mississauga Steelheads last season, adding six goals and six assists in six playoff contests.
Alex's older brother, William, made the Toronto Maple Leafs' opening-night roster following a 22-game NHL stint in 2015-16.
The Sabres also sent forwards Nicholas Baptiste and Daniel Catenacci, and defenseman Justin Falk, to their AHL affiliate Tuesday.
