Spurs reject Marcus Edwards was Man of the Match as Antonio Conte’s side were stunned by two injury-time Sporting goals.
The 23-year-old - tipped for an England call-up by boss Ruben Amorim - was allowed to leave Spurs in 2019 after being hyped up as a teenager. But he almost scored a first-half wonder-goal as part of an outstanding display.
Substitutes Paulinho and Arthur Gomes struck late to put Sporting in charge of Group D and Edwards said: “I could not be happier.