England won 5-0, with Kane on the scoresheet on Tuesday night.
Kane said afterwards: "I spoke a lot yesterday about how we wanted to play – being on the front foot and being aggressive, and I think we showed our level today. Even in the other games, we did well, but we didn't reach top form.
"We scored five and made it look comfortable. We can be proud of ourselves. It has been a great camp and we are in a great position.
"They found it difficult to play. Whenever they did break, we recovered quickly. Overall, we can be pleased with the whole week and we will take this into the next camp. The energy has been higher and the level has been higher.
"We felt we had a good performance a few days ago. I know it wasn't the performance that everyone was excited about, but we did what we had to.
"Serbia are a good team, and we made them look average tonight."
Arsenal midfielder Declan Rice also stated after the win: "Incredible night. We knew it was going to be really tough coming here, but a five-star performance. We took control from the very first minute, and we needed that tonight."