The pair were impressive in defeat to friendly opponents Valencia.
"I thought we were building up a better understanding towards the end of last season," Walker told the Spurs website.
"It's difficult, because I always want to get forward and that's obviously Azza's strength as well.
"We're understanding each other a lot better, not taking it in turns to go forward, but knowing when to go and who is better to go. It's all positive."