The match began positively for City, with Phil Foden taking advantage of a defensive mistake by Sporting to score within the first four minutes.
However, Sporting quickly regained their composure and shifted the momentum.
By the 38th minute, Viktor Gyokeres equalized for Sporting, finishing a close-range effort after an excellent through ball from Geovany Quenda.
Shortly after the break, Sporting ramped up their offensive efforts. Maximiliano Araujo scored in the 46th minute, giving Sporting a 2-1 advantage.
Just minutes later, City’s Josko Gvardiol committed a foul in the penalty area, leading to a penalty that Gyokeres converted with confidence, extending the lead to 3-1.
City briefly saw a chance for a comeback in the 67th minute when a VAR review awarded them a penalty, but Erling Haaland's attempt hit the crossbar, thwarting their hopes.
Phil Foden also came close with a free-kick in the 74th minute that narrowly missed the target.
Sporting ultimately sealed the match in the 81st minute, with Gyokeres completing his hat-trick from the penalty spot, despite Ederson's effort to save it. This defeat leaves Manchester City in a precarious situation as they strive to recover in the Champions League.