Wenger said: "I don't know how many more players we need for next season but it's not a question of numbers. It's a question of one or two real quality players.
"And up front I feel I need to give time to Nicklas Bendtner and Theo Walcott because they have made big improvements.
"What we could not stop was conceding goals in big games. Nine times out of 10, the team who win the big games is the team who score first. But we lost all these games after being in front every time, so we suffered more as a team defensively than offensively."