Zaha impressed in defeat to Thailand's Singha-Allstars.
"It was an incredible feeling really, to come on and play with the likes of Rio, Ryan Giggs, Anderson... knowing I was on the pitch with them was good enough for me," he told manutd.com.
"The humidity is crazy but we've just got to push on. And it will be good for our fitness when we go back to England.
"We've been working hard in pre-season training but a game like this was exactly what we needed. In some ways the weather helps us as well because you don't even need to run to get a sweat on. It helped our fitness a lot."