“You get a little bit more tense and you start to have the fear of losing something.
“It’s much better energy to have the energy to win what you already have and not just think about maintaining what you already have and not losing because you start to play much more restricted and lose the flow of the game and your confidence. It’s something that we cannot do.”
Arsenal hold a 3-1 advantage over Olympiakos and are among the favourites to win this year’s Europa League.
Pierre-Emerick Aubameyang is expected to come back into the starting line-up after being disciplined for being late to the game against Tottenham.