Luukkonen (lower body), as expected, was officially ruled out against the Rangers on Thursday, Heather Engel of NHL.com reports.
Luukkonen was expected to miss at least a week to open the season, so his absence for Opening Night shouldn't come as a surprise. With the 26-year-old backstop on the shelf, Alex Lyon looks poised to play Thursday -- though head coach Lindy Ruff hasn't officially named a starter. Despite missing the early part of the year, Luukkonen should still reach the 50-game threshold this year as the Sabres' No. 1 option in the crease, assuming he can shake off his injury issues.