Walker spent time on-loan at today's opponents.
"A lot has changed since I was there, obviously the manager, and a lot of the players,” he told the Spurs website. “But I did play with a lot of the youngsters there like Weimann, Clark, Albrighton and Lowton.
“They are young, energetic and hungry to win games.
“They’ve proved they can dig in at Villa Park. I watched the game against Manchester United (Villa led 2-0 before going down 3-2) and the result just didn’t go their way.
“It will be difficult but we need to play the way we’ve been playing and I’m sure we’ll get the right result.”