Sven-Goran Eriksson ripped into his Leicester side after they were humbled 2-0 by Reading at the King Power Stadium.
Reading, who were beaten in last season's play-off final, are intent on going one better this season and took the lead through a stooping Noel Hunt header midway through the second half.
Substitute Hal Robson-Kanu made a case for a place in the starting line-up when he scored with a stunning curling effort in the last-minute of the game.
Eriksson said: "We were very poor, especially in the first half. We couldn't keep the ball. We had no flair and overall we played too many long, flat balls which were easy for Reading to defend against.
"We were very, very poor and it is frustrating for everyone.
"For the players and squad we have we have to do much better - there is no doubt about that.
"I'm sorry we couldn't do better in our first home game.
"We lost the ball and got nervous and frustrated. In the second half we were a little better.
"In pre-season I thought we were very good, playing good football, but today, especially in the first half, we were not a good standard.
"I've told the players that such good players as them should not give the ball away so easily."
Reading manager Brian McDermott thought his side were comfortable winners and singled out striker Mathieu Manset for special praise.
He said: "I thought it was a thoroughly deserved win. We were well organised and passed the ball well and stuck to our game-plan.
"It was never going to be easy coming here. There's a lot of expectation here - you can smell that.
But I know their players well and we talked about us a lot and about how we could hurt them and I thought we did that today.
"It was always going to be difficult to come here and win today so we are delighted with the three points and a clean sheet to boot.
"Manset did very well. He's a young lad at 22 years of age. He's very, very strong and he's got real talent.
"He's worked really hard during the summer. He's getting fitter every day and we have got high hopes for him. He's a really popular lad within the group and I thought he did really well today."