Despite the late heartbreak, Rossoneri fans heaped praise on Walker, with some even comparing him to club legend and World Cup-winning former Brazil captain Cafu.
A fan with the X-handle of Cristian wrote: "Unreal performance by Kyle Walker today. Nice to have a proper right back for the first time since Cafu."
Martino Puccio said: "Kyle Walker looks so good for someone that has supposedly stunk according to many of you."
Matt Santangelo praised Walker for his composure on the pitch as added: "Kyle Walker’s introduced himself quite well to the fans on his Milan debut. There is just that calm, experience and pedigree that he’s attained over a long successful career. He may have lost a step, but his leadership and steadiness in a debut derby has been refreshing."
A fan named Inside Milan posted: "Very Very Solid debut for Kyle Walker! Looking like a BIG upgrade!"
Meanwhile, @Rosspagnero stated: "Kyle Walker never leave my club, I experienced 6 months of the most grueling RB play in football history from Emerson Royal, I deserve this."