Porto midfielder Raul Meireles says without Cesc Fabregas, Arsenal always struggle.

Meireles says their big challenge is to stop Arsenal captain Cesc who is the biggest threat.

Meireles said: "Cesc Fabregas is a big footballer and is the key piece in Arsenal. We must stop him being a danger.

"Without Fabregas, I am convinced that Arsenal lose a big part of their percentage. Our mission is to make sure that we can stop Arsenal and go to London with a chance of going through."