But the Liverpool keeper also believes that he cannot dwell too much on those errors. He can only learn from them and try to improve his game.
"Maybe I could have done better against Man City. I didn't see it as a massive mistake because he [Sane] hit it quite well,'' he said.
"In other games I haven't had too much to do. I've come for crosses and collected them.
"At Swansea [Alfie Mawson] put it right in the corner and there wasn't much I could do.
"You can't get frustrated as you know there will be games when the team needs you more and you have to be there.
"I wasn't begging in the other games: 'Please, please, I need a save.' I knew it would come.
"I had more to do against Tottenham and I tried to help the team.
"My head is right. I feel like I've learned a lot from last season and I feel good.''