The goaltender had 18 wins with the Calgary Flames last season, as he spent the 2015-16 season with Buffalo.
Goaltender Chad Johnson signed a one-year, $2.5 million contract with the Buffalo Sabres on Saturday.
Johnson, 31, was 18-15-1 with a 2.59 goals-against average, a .910 save percentage and three shutouts in 36 games, all starts, for the Calgary Flames last season.
He had his best NHL season with the Sabres in 2015-16, with personal NHL bests of 22 wins, 45 games played and a .920 save percentage.
Selected by the Pittsburgh Penguins in the fifth round (No. 125) of the 2006 NHL Draft, Johnson has played for six teams in seven NHL seasons and is 68-45-12 with a 2.44 GAA, a .915 save percentage and seven shutouts in 137 games (124 starts) with the Flames, Rangers, Phoenix Coyotes, Boston Bruins, New York Islanders, and Sabres.