Mario Gila was outstanding on his outing against Torino before cramp forced him off, and his display made clear how quickly he has become a fixture in Ruben Amorim's back line.
The Spaniard arrived from Lazio with two seasons of top-flight football behind him, and the question was never really about his quality but about how it would translate into a three-man defence. On the evidence of the Torino win, the answer looks straightforward.
As MilanNews report, Gila fits what Amorim asks of a centre-back almost exactly: pace, aggression, tenacity and a willingness to lead in both phases. That was a shift in tone from what the fanbase grew used to under Massimiliano Allegri, when the defensive line sat deeper and played more passively. Gila is a defender who sets the terms, pushing the line up and hunting the ball back high.
The approach held until around the 75th minute, when Milan suffered a natural drop in fitness. Ignazio Abate's introduction of Alieu Njie in the closing quarter of an hour turned the pressure onto Milan's right flank, with Gila hampered by cramp and Samuel Chukwueze fading alongside him.
His absence in that zone was felt immediately. Milan struggled to contain the right side once he went off, and the reshuffle told the story: Alexis Saelemaekers was moved to right wing-back to shield Koni De Winter, who had been shifted across to the right after Matteo Gabbia came on centrally.
That a single substitution and one forced withdrawal could unbalance Milan so quickly is the concern buried inside an otherwise encouraging debut. Gila already feels irreplaceable, which is exactly why the depth behind him matters. If the back line leans this heavily on one man, Milan need more cover before injuries or fatigue make the point for them again.
From here, the reinforcement question sits with Amorim and the club's recruitment planning ahead of the next window.