Tottenham go looking for their first Premier League win under new manager Villas-Boas when they take on Reading at the Madejski Stadium this afternoon.
Walker said: "It has been frustrating but football is frustrating at times. The gaffer has been top class and the training is the hardest I have ever done.
"We are quite capable of going on a 12-match unbeaten run. We have the players and we have the attitude. Then people won't be talking about the wobbly start. Top Four ? Yes - and why not higher than that?"