Already without the quartet of Neymar (ankle), Nordi Mukiele (hamstring), Presnel Kimpembe (Achilles) and Nuno Mendes (hamstring), who will not play again this season, PSG also lost Hugo Ekitike and Fabian Ruiz to unspecified issues in last weekend's win over Auxerre.
With neither Ekitike nor Ruiz training earlier this week, Galtier is sweating over the fitness of both men at present, while Achraf Hakimi must also serve the second of a two-game suspension for his red card against Ajaccio.
Gianluigi Donnarumma did not cover himself in glory for Auxerre's consolation last weekend, but the Italian - who also made some crucial saves on the night - will be shielded by Marquinhos, Sergio Ramos and Danilo Pereira as ever.
Hakimi's absence will open the door for Warren Zaire-Emery to start at right wing-back, while Juan Bernat continues to deputise for the stricken Mendes on the opposite side.
Galtier has opted for a 3-4-3 in recent weeks, but injuries could force the Parisiens coach to revert to a 3-5-2, potentially with Vitinha and Renato Sanches both coming into the engine room if Ruiz does not make the cut.
Amid links with a move to Real Madrid or Manchester City, Marco Verratti should also start, but the Italian was another player absent from training this week for unexplained reasons.
Kylian Mbappe and Lionel Messi were also nowhere to be seen in practice on Tuesday, but the deadly duo will be expected to line up from the off at the Stade de la Meinau.
Paris Saint-Germain possible starting lineup: Donnarumma; Pereira, Marquinhos, Ramos; Zaire-Emery, Sanches, Vitinha, Verratti, Bernat; Messi, Mbappe