Defoe, who has played more than 350 games for Spurs during his career, moved to the Black Cats this week signing a three-and-a-half year deal on Wearside.
And Tottenham???s 42-year-old manager wished him well, even though the north London club face Sunderland in the Premier League this weekend.
Defoe, who ended his stay with MLS team Toronto by agreeing to be part of a swap deal with American Jozy Altidore, recently trained with Tottenham???s development squad.
But when asked at the pre-match press conference on Friday whether Defoe might take some insider knowledge of the Spurs camp with him to the north-east, Pochettino said: ???He spent time here for a few days.
???But all the best to him as he???s a very good player and very good guy.
???He was training with the under-21s here the last week. But in football you also have the information anyway.???