Manuel said both have played well enough to handle a job next season, although nothing is guaranteed as the Phillies' front office will be constructing next year's roster in the offseason.
Kratz entered Thursday hitting .254 (34-for-134) with nine doubles, nine home runs and 26 RBIs in 47 games, although he had hit just .185 (12-for-65) since Aug. 23.
"Kratz has proved he has value as a backup catcher," Manuel said. "When I look at somebody like Kratz, I think to myself, Kratz fits. He's durable. He's strong. He definitely showed he can call a game. He showed he can throw. He showed he can hit a home run. I look at him and say, 'We got better if we've got Kratz as our backup catcher.'"
Frandsen entered Thursday hitting .331 (56-for-169) with six doubles, three triples, two home runs and 13 RBIs in 48 games.
"Frandsen, because he played different positions, he could be a utility player or a platoon player or something like that," Manuel said. "I'm not saying he can't play regularly, but he could fit on our team and make us better in that capacity."