Gallen expects to be available out of the bullpen Sunday against the Padres, Steve Gilbert of MLB.com reports.
He did not throw his usual between-start bullpen session over the weekend in case he was needed on the final day of the regular season. Arizona gets into the postseason with a win Sunday and losses by the Mets and Atlanta, so Gallen could end up appearing and qualifying for a win or save in relief of Brandon Pfaadt.