The Mets selected Kranick's contract from Triple-A Syracuse on Tuesday, Mike Puma of the New York Post reports.
Kranick was booted off the Mets' 40-man roster back in May and has yet to pitch for them at the major-league level. However, the club has elected to add him to its roster for the wild-card series against the Brewers in a long-relief role. Kranick posted a 3.82 ERA and 64:24 K:BB over 70.2 innings this season at Syracuse.