Scott Dann scored a late winner after Philippe Coutinho had cancelled out Yannick Bolasie's early strike for the visitors, with the Eagles continuing their impressive record against the Reds.
Ibe - who was handed a start after an impressive goalscoring display against Rubin Kazan three days earlier - said the side wasn't using their European exploits as an excuse.
The 19-year-old said: "It's disappointing, everybody's angry.
"We played alright and we created chances to get the goals but it just didn't come today.
"[The manager] just told us to keep our composure because it shouldn't be an excuse having a midweek game.
"We didn't start the best, it's just improving on that and starting from the first minute, keeping the ball, keeping composure, building into the game and trying to win."
It halts a bit of momentum that Liverpool were carrying into the game after three successive wins in all competitions and gives Klopp food for thought during the international break - as a couple both of the goals conceded could be attributed to individual errors.
Emre Can inexplicably gave the ball away that led to the opener, while questions could be asked about Liverpool's inability to deal with a set-piece again, and goalkeeper Simon Mignolet making a save by punching the ball back into the danger zone for Scott Dann to follow up.
But there were signs that Liverpool were developing the sort of zest and movement in the final third that made them feared only a couple of seasons ago, but they need to find more ways of scoring, and more players to chip in with goals - as they have only found the net more than once on two occasions this season.
As for Ibe himself, he seems to be one of the younger players who is thriving on the working environment that has been developed by Klopp at Liverpool.
There is a bit of time for Liverpool to think about how to put things right after the international break, but they face the sternest of tests in the process against Manchester City at the Etihad Stadium when they return to action.