Torreira has received a lot of praise for his adaptation to life in England, but Sky Sports pundit Paul Merson believes that's because Arsenal have missed a player like him so much. He's not a natural passer, but he sets the tempo. He gets people going.
Torreira joined the Gunners in the summer for a fee of around £26m and has since taken the to the Premier League like a duck to water.
Arsenal haven't had a capable defensive midfielder in almost a decade, so it's only natural that when a good one arrives, he gets praised to the rafters.
Alexandre Lacazette scored the only goal of the game, with most of Arsenal's first-team stars rested ahead of Sunday's Premier League tie with Southampton.
'But for the last four or five years they've been one of the worst in the world without the ball. He has changed that.
'When Torreira gets around people, it's a domino effect, and everybody else rallies and gets around the opposition players.
"Liverpool wouldn't buy him tomorrow morning, I wouldn't have thought any of the top four would". He can and will get better, but he's done great.
"Arsene Wenger knew it but he was too stubborn to go and get someone".
"And his attitude is great; he leaves nothing on the pitch and gets stuck in.
He gets around people, closes players down, gets everybody fighting", Merson told Sky Sports.
Torreira claimed the club's player of the month award for November having scored two goals in his last three matches, including last weekend's late victor against Huddersfield. No-one would mention it. "It's just that Arsenal needed it so badly".
The former Sampdoria man will be hoping to help the north London side to finish in the top four this season after they ended up sixth and without a trophy under Arsene Wenger last term.