Porto goalkeeper Diogo Costa: 'If Arsenal are favourites to win Champions League, they need to show us'

FC Porto goalkeeper Diogo Costa is unfazed about taking on an in-form Arsenal in the Champions League Round of 16 first-leg tie.

The Gunners have enjoyed some high-scoring wins lately and have won their last five Premier League games.

With Arsenal set to take on Porto later this Wednesday, the big clash could not have come at a better time but Costa insists Arsenal have 'weaknesses' to exploit.

Quoted by HaytersTV, Costa said: "Of course [Arsenal] have weak points.

"Of course, I’m not going to tell [you] what we’re going to do. We’re going to do our best job to win that game.

"If they are the favourites [to win the competition], they need to show us they are the favourites."

'Arsenal haven't won anything yet': Jamie Carragher makes bold Champions League claim