On February 28, 2014, before the 2013–14 trade deadline, Halák along with Chris Stewart, William Carrier, a first-round draft pick in 2015 and a conditional third-round draft pick in 2014 to the Buffalo Sabres for Ryan Miller and Steve Ott. Halák however did not play a game for the Sabres and was traded along with a third round draft pick to the Washington Capitals for Michal Neuvirth and Rostislav Klesla at the trade deadline.