Centre-back: Ben White (Arsenal)
Eyebrows were raised when Arsenal splashed £50 million for Ben White in the summer, but the player has responded to his critics in style with top performance lately.
The 24-year-old is averaging 3.6 clearances per game in the league whilst he's forged an impeccable partnership with Gabriel in defense that has provided the foundations for their revival.
Centre-back: Gabriel (Arsenal)
United's centre-backs have been disastrous this season, especially Harry Maguire, while Raphael Varane, the only reliable option for them at the moment, is currently injured.
Gabriel is the only remaining choice and he's been truly impressive at the heart of Arsenal's backline, whilst also scoring a goal in the 2-0 win over Leicester City.
Left-back: Nuno Tavares (Arsenal)
Nuno Tavares has been a revelation for Arsenal this season, with the Portuguese youngster taking his chances superbly with eye-catching performances.
He's confident, committed, fearless, fiery and, most importantly, runs his lungs out to bring industry and dynamism to Arsenal's left-back position. One for the future?