The Brazil forward was ruled out for up to four weeks after suffering an adductor injury in PSG's Coupe de France clash with Caen on Wednesday.
Neymar will miss Tuesday's trip to Camp Nou to face his former club Barcelona in the first leg of their Champions League last-16 tie, while he is also in doubt for the return clash.
Garcia, whose team are second in the Ligue 1 table ahead of PSG by a point, said the injury was a major setback for Mauricio Pochettino's men.
"I've always said, the greatest players we want to see on the pitch rather than in the infirmary. It is a great pity that Neymar was injured.