Asked about Firmino's availability, Klopp said: "It's good to have him here, he looks in good shape, and if possible we will see [if he can play against Napoli]".
The Champions League finalists will kick off as second favourites behind Manchester City, and they're seen as the Citizens' main rivals for a reason, as they dished out one of only two City defeats of the Premier League season past year.
Despite that, Fekir has continued to be linked with a move to England.
"He was for a long time in his youth an outfield player [and] he must have been a very good outfield player as well because he's really good in that".
Chelsea are looking to hold talks with Lyon chiefs tonight after their pre-season friendly. I feel great in the group. When Manchester United visit Anfield in December, I'm sure they'll use every trick in the book to try to wind him up! "He probably won't play Tuesday and Sunday will be very hard as well", continued the German, who is known to stick to a very rigorous training strategy. It is a bit like the French national team: a mixture of youngsters and older players, with some players more experienced than others.
"I've always known about the things we could do and the opportunities we have".
Chelsea remain in the hunt for new players before the transfer window slams shut on Thursday night.
Plundering goals appeared easy for Mohamed Salah upon his arrival at Liverpool previous year, but adjusting to British road conditions was apparently more of an issue for the Egypt star.
Alvaro Morata, who was particularly wasteful at Wembley, looks set to remain at the club but they did miss out on Gonzalo Higuain to AC Milan earlier in the window.