Arsenal must also focus on the EPL, they also don't want to lose the opportunities that are right in front of their eyes.
This is why i don't think Arsenal will win the Europa league, they are leading in the Premier league and it is the trophy that they want to win, if they can win the both of them, Arsenal fans would be very happy, but if any Arsenal fan, coach or player is asked which trophy they want to win, we know they will all say it is the premier league. So even if Arsenal beat Sporting and qualifies for the quarter final of the Europa league, Arteta may start rotating his team in that tournament, he would not want his players to be tired for their premier league games. If there is a premier league that can win the Europa league i would say it is United.
Arsenal are now focusing more on the English Premier League. The team managed to secure victory in the last match remarkably. In spite of being behind the opposition team, the victory was secured in the end with 3-2 goals.