Defoe had to pay £3,000 to charity last season after he lost a bet with Wilshere that Tottenham would finish above their north London rivals for the first time since 1995.
The Spurs striker lost the wager after his team threw away a 10-point lead over the Gunners. This season they are seven points ahead with 10 games left.
Yet Defoe, who played in Tottenham's 2-1 win over Arsenal on Sunday, believes Spurs are made of stronger stuff this season.
"We all know what happened last season," said Defoe.
"At the time, when I did have the bet, I thought we would have finished higher than Arsenal and I still feel like that now.
"Jack's a cool guy, there's a little bit of banter and even though we beat them quite comfortably, I still think they're a good side, but I suppose if Jack wants a little bet, it's no problem with me.
"We've not just got a great team now, but a great squad. The spirit is great, the lads are buzzing and it's just a great time to be here."
I love these types of "counting chickens" comments. Having said that, I wouldn't bet him given our form of late.- vaseline gang