Madrid (Spain), May 03 (ANI): Arsenal coach Arsene Wenger said that his team will try to keep the ball in Atletico Madrid's half in order to keep striker Diego Costa at bay in their Europa League second leg. Costa rejoined Atletico after three seasons at Chelsea where the Brazilian born striker got to know the Premier League side. "He played in England and he was very successful but it is our job to keep him quiet and maybe the best way to keep him quiet is not to play too much in our half and play more in the half of Atletico Madrid," said Wenger. "We know we need to score. So we have a clear demand in our heads and the clear approach. We need to have a positive way. The only way what we don´t know is will Atletico Madrid do the same? Will they in the opposite have a more cautious approach and try to get us on the break, that's what we have to deal with in the game," added Wenger. With the tie poised at 1-1, Arsenal are forced to score if they want to battle to book a ticket to the final.