Coutinho, 25, made his first appearance of the season for Liverpool against Sevilla in the Champions League last night.
But he was unable to make an impact in his 14-minute cameo off the bench as the Reds had to settle for a 2-2 draw with the La Liga side at Anfield.
The Brazil international was caught up in a transfer saga involving Barcelona throughout the summer.
Barca boss Ernesto Valverde was determined to sign Philippe Coutinho as a replacement for Neymar, who joined Paris Saint-Germain in a world-record £200million deal.
Philippe Coutinho makes Liverpool return against Sevilla
Wed, September 13, 2017
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Philippe Coutinho was lectured by Jurgen Klopp ahead of his Liverpool return
Phil trained in the last few days really, really well but tonight a few situations were not too lucky and he was without rhythm
Liverpool boss Jurgen Klopp
Coutinho even handed in a transfer request to try and force through a move to the Nou Camp, but Liverpool rejected all three offers Barca put forward and issued a statement to outline he was not for sale.
Brazil team-mate Neymar revealed Coutinho was ‘disappointed and sad’ that his move failed to materialise.
But Klopp, who rested Coutinho when they were thumped 5-0 by Manchester City, reckons he is well on the way to getting back to full fitness.
“Phil trained in the last few days really, really well but tonight a few situations were not too lucky and he was without rhythm,” Klopp said.
Liverpool boss Jurgen Klopp insists Philippe Coutinho needs more time to find his rhythm
“But it helped him he could play tonight and it helped us in the long term, for sure, so all OK.”
Liverpool resume their Champions League campaign against Spartak Moscow on September 26 (7:45pm).
But up next for the Reds is a Premier League clash with Burnley on Saturday (3:00pm).