Uruguay International will only make its seventh Premier League start when Wolves visits Emirates Stadium on Sunday, but his significance for Unai Emery's rapidly improved team is clear.
Torreira has a combatant presence that works in the midfield and gives his back four with protection while his use of the ball has been as impressive.
Other players in Emery's show may have given more spectacular moments during Gunners' unbeatable race of 15 games.
However, it is Torreiras and Granit's Xhaka contribution, which has been transformed from the inconsistent player in recent seasons, which has given reason to believe that this Arsenal side has the steel to maintain its early cost.
The pair has set a balance in the team that was missing for long periods in the last years of Arsen Wenger's reign.
After building his early success in northern London around a centerfield led by Patrick Vieira, Wenger's failure to solve the visible frailties in his later sides was sometimes confusing.
Gilberto Silva offered admirable service, but since Brazil's international left for Panathinaikos 10 years ago, few players have proven to be able to fill what often seemed to be an obvious gap.
However, the arrival of Torreira in a £ 27 million ($ 35 million) deal from Sampdoria this summer seems to have stopped waiting.
– Give credit –
Emery relieved the 22-year-old in his new life in English football and introduced the player from the bench for the first five league games before deciding that Torreira would be corrected.
And his gritty performance in last weekend's 1-1 draw with Liverpool confirmed that he has come into his new environment.
"You have to give him credit because he is someone who works hard, who wants to work hard and who shows it on the plane," says Arsenal defender Shkodran Mustafi.
"Against Liverpool, he recovered a lot of balls, and it makes it not only easier for the defenders, but for the whole team.
"I've changed many leagues, many countries myself and I know it's not easy to get in. I think he's been doing well."
The exercise of Emery's team against Liverpool strengthened the belief that they have a chance to appear as true challengers in the Premier League competition.
Arsenal's main priority is to return to the Champions League after missing last season and challenging at the top of the table would be an added bonus.
The performances have been steadily improving, and Emery's influence is already felt.
The next test is to keep this shape and the loss of England forward Danny Welbeck to a serious injury to an injury this week will not help.
But Torreira has so far provided Arsenal with qualities they have been missing and if the midfielder continues to perform as he has, Gunners may need to review their goals as they enter the second half of the season.