That set up Thursday’s clash with Toulouse as an opportunity to impress and build rhythm, but the Japan captain struggled and, having already been booked, was brought off at half-time.
Mac Allister will miss the game either way, but this has now thrown Endo’s chances of starting into question.
“Wataru was, for us, all the time very important,” the manager said.
“That’s again another part of football: you line up an XI, they play well and then you think the others don’t do well. That’s not true.
“Wataru makes steps every day and that’s important. We had stories like this in the past.
“This year it looks a little bit different, that players maybe fit in a bit quicker, but we had stories.
“Andy Robertson didn’t play for half a year, nobody can remember it anymore but it was like that.
“Other players as well had their struggles in the beginning. That’s all fine. He didn’t even struggle, we played pretty good, successful and he is super-important for us.
“He played a lot of games. If he plays all the games, you say, ‘he is not starting in the Premier League‘.
Whether things have changed in Klopp’s mind since the loss to Toulouse remains to be seen, with Endo’s sluggishness seeing him go close to a red card.
The timing of his pre-recorded press conference confuses matters, but the likelihood is that the German’s faith will not have wavered and Endo will start alongside Dominik Szoboszlai and Harvey Elliott.