Thomas Tuchel felt Neymar's lack of competitive matches showed and he backed Kylian Mbappe after Paris Saint-Germain's loss to Borussia Dortmund.
Erling Haaland's brace inspired Dortmund to a 2-1 home victory in the first leg of the Champions League last-16 tie on Tuesday.
Neymar was on the scoresheet on his return from a rib injury, while Mbappe also missed PSG's draw with Amiens on Saturday.
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Tuchel felt PSG's busy schedule and injuries to their stars had played a part at Signal Iduna Park.