Take a look at your back formation, if you play a back 3 then it needs to be 3W( DL,DC,DR) playing narrow allows the corners to get to th box easier!, a back four is a even better defence against them as you have an extra body in the box!, having defenders with ariel and defencive wall and a goalkeeper with a SA helps aswell, also one final tip, try to buy defenders thats playing foot corresponds to that side position i.e DL left footed, DR, right .