#2 Lucas Torreira

Not much was known about him when it was rumoured that Arsenal were keen to sign Lucas Torreira from Sampordia. Eventually, he has proved to be one of the best signings that Arsenal have made in recent years.
The Uruguayan was exactly the player that the team lacked over the last few seasons. He knew exactly when to make a challenge and was not afraid to throw himself to make a tackle. The 23-year-old has a passing accuracy of 87.8% and alongside Granit Xhaka, the duo have performed pretty well in all competitions.
Torreira became a fan favourite as soon as he played his first match for the Gunners. What mattered even more was that his first goal for the club came in the North London derby. His energetic displays in the midfield truly make him one of the best signings of the season.
Without him, Arsenal looked like a mess in the midfield at times.