Spurs go into Thursday's clash against Maribor with three draws from three games in the competition, but a shock 1-0 home defeat to Wigan on Saturday means they are in poor form.
However, the 22-year-old right-back feels it is a privilege to feature in a European competition, and thinks boss Andre Villas-Boas would also like to win the trophy he first claimed with Porto.
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The group is finely balanced with Lazio, Panathinaikos, Spurs and their Thursday night Slovenian opponents all separated by just three points in Group J - but Walker believes all of their opponents are beatable.
He continued: "No disrespect to them, but these are all winnable games.
"With the players we have in our team - we have world-class internationals - we can win this one, go to Lazio and give them a good game, and beat Panathinaikos and the table will look good come the end of it."