Cesc Fabregas has made no secret of his frustration with the constant errors that are threatening Arsenal's season.

The Gunners were again undone by individual mistakes in their 2-1 Champions League first-leg defeat at Porto this week.

"The other top teams don't make these mistakes as often as we do," said Fabregas.

"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."