Arsenal boss Arsene Wenger would not single out goalkeeper Petr Cech for blame after the 2-0 home defeat to West Ham United.
Cech was culpable for both goals on his Premier League debut for the Gunners following his £10 million move across London from Chelsea over the summer.
Wenger thought his side was collectively poor as West Ham twice capitalised on slack defending from the Gunners.
"I think our performance was not convincing," Wenger told the club's official website. "On the two aspects of our game, going forward and defending. Overall we were punished.
"On top of that, I feel we gave two very cheap goals away and they were at the wrong moments -- just before half-time with two minutes to go, and just after half-time. We gave ourselves a mountain to climb."
When asked about Cech, the coach said: "I haven't spoken to him yet. I can't see many individual convincing performances today so it's difficult to single someone out."
He added: "West Ham are a bit more advanced in their preparation than us. They've played many competitive games in the Europa League. I knew before game it would be tricky game on that front.
"A big part of it was not to concede, even if we played for a 0-0. The way we conceded the goal just before half-time, with experience we have in our team, is difficult to understand.
"I felt we were a bit nervous and we rushed our game a bit. We didn't always respect the basics. We wanted to be too quick going forward in first half. I don't think we were too confident, I would rather say too nervous maybe.
"Our passing was not incisive enough. I brought Walcott on with 35 minutes to go and I had no time to bring him on. We conceded the second goal [before]. After that they defended deep and gained time -- the usual thing you face when you play at home and are losing. I believe that we are maybe guilty at 0-0 of giving them a goal as soft as that."
Wenger vowed that his players would learn from this defeat and bounce back when they travel to Selhurst Park next Sunday.
"A successful season is how you respond to disappointments and it's never a clear motorway," he said. "We have to respond quickly. We have a tricky start. Crystal Palace are a very good team, Liverpool are a very good team, and you could see again today that we are not completely there physically."
Wenger remained coy about his plans for the remainder of the transfer window.
He added: "Again, I can only repeat what I already said. If an exceptional solution turns up, we'll do it. But after a defeat like that, it's important not always to think we take a solution from outside."