The Spurs right-back has been impressed by the former MK Dons man.
The 19-year old was signed from MK Dons in January but stayed there on loan for the second half of last season.
He finally joined up with his Spurs team-mates for pre-season this summer and quickly impressed in friendlies against Real Madrid and Milan.
Alli continued that form into the start of the campaign and after making an impact off the bench for the first few games, has now established himself in the first XI.
An England call-up quickly followed and he gained his first two caps as a substitute during last week’s international break.
It’s a remarkable rise for the young star who was playing League One football just five months ago, but Walker feels he has the right mentality to cope with his rapid progression.
“He’s been fantastic, a breath of fresh air,” said the 25-year old, in an interview with Spurs TV.
“He’s a very exciting player, he’s young but he’s got both feet firmly on the ground which is very important.
"It’s a massive learning curve for him, in the right sense, going there and getting a taste for it and hopefully he’s in the next one (England squad)."
Alli is perhaps the best representative of what Spurs are trying to achieve under Mauricio Pochettino and he is one of several young English talents currently leading the Tottenham revolution.