Despite being just 24 years of age, Rojo was the club's most experienced defender in Saturday's starting line-up.
The Argentine international occupied his more familiar role at centre-back, putting in a solid shift whilst marshaling the back four to good effect.
He looked undaunted despite playing alongside Paddy McNair in the 19-year-old's first senior game for the club.
Luke Shaw was also making his debut at left-back, but the defence performed resolutely, aside from conceding a goal to Diafro Sakho following a corner.
Rojo fulfilled his defensive duties, completing 11 clearances - second to only McNair - four interceptions and two blocks.
He proved his knack for reading the game here, as well as his ability to compete directly for possession, emerging victorious from 100% of his attempted tackles.
However, Rojo will be slightly disappointed with his success rate in the air, having won just two of five attempted headers.
Confined by his position, he did little to influence the Red Devils' success in the final third. Nonetheless, he proved his reliability in possession as he recorded 86 touches - second to only Rafael.
He utilized this control with positive results, attempting a total 66 passes; 88% of which found the intended target.
Unlike in his first two appearances for the Red Devils, the opposition failed to dispossess the Argentine on Saturday. He gave an assured display from start to finish.
We witnessed a much improved performance from a player who faced copious amounts of criticism after last weekend's 5-3 defeat to Leicester City at the King Power Stadium.
Rojo seems far more content in the centre of the park, the position one would expect him to dominate until the New Year, at the very least.