Arsenal lost 2-1 in their Champions League tie against Porto after conceding two soft goals.
“The other top teams don’t make these mistakes as often as we do,” Fabregas said in the Daily Mail.
“Sometimes we make mistakes that at the top level you pay for and this is one of those nights.
“It happened against Chelsea and Man United and now again so I think we have to try to find the solution to these problems because it is costing us many, many things.”
