The Brazilian had been sporting an eye injury after Jan Vertoghen had poked him in the eye in the game against Tottenham.
The player had been receiving treatment at the eye hospital, Moorfield.
Klopp speaking after the sensational win over PSG said there was no chance he was going to include Firmino in the squad for the game but that the Brazilian showed up in training on Tuesday and said his eyes were okay.
Firmino would go on to be the match winner after Salah had made a mistake that allowed Mbappe to equalize for PSG.
Liverpool looked set to win after Daniel Sturridge had scored with an header and James Milner had slotted in a fine penalty. However, Tuchel's men put in quite a fight with Thomas Mueneir getting a goal before the halftime. Then the mistake from Salah that led to the equalizer.
Liverpool sits top of group C after Red Star Belgrade and Napoli drew blank.
I am 
Read more sports stories, highlights and news on Sprtshub
