Spurs left Serbia with a 4-0 result, but Alli was impressed by the support the home side received.
He said later: "We are very happy about this win. It was important to us, both in terms of results, because we want to move on, but also psychologically, because of the slightly worse games on the away pitches and on the domestic scene.
"The atmosphere in the stadium was great. Really, great. However, we were able to concentrate our efforts in a focused way, we did our best because we knew it would be difficult. We tried to stay calm despite that atmosphere and so we managed a win."