Galtier was announced as PSG's new head coach on Tuesday, with the former Lille and Nice boss signing a two-year deal with the club.
The man who beat PSG to the Ligue 1 title when in charge of Lille during the 2020-2021 season takes over a squad containing two world-class goalkeepers in Italy's Euro 2020 hero Donnarumma and three-time Champions League winner Navas.
Pochettino used both goalkeepers often during his one full season in charge of the Parisian giants, with Navas making 26 appearances in all competitions and Donnarumma featuring 24 times.
Donnarumma managed one clean sheet more (nine) than Navas did (eight) despite making two appearances fewer, while the two goalkeepers posted similar save percentage figures (Navas saving 75.76 per cent of shots faced compared to the Italian's 75.27 per cent).
Speaking at his unveiling, Galtier argued having a nominated first-choice shot stopper would provide greater clarity.
"I always work with a number one and a number two," he said.
"It's easier for me and for them to know their position within the squad. I haven't met them yet, but I will do it very quickly."
PSG conceded 36 goals when winning Ligue 1 last season, the joint-fewest in the league alongside Galtier's former club Nice, who registered one more clean sheet (14) than the champions.