The Spurs secured their first title since 2007 as they overcame the Miami Heat in the Finals, taking the series 4-1 following their 104-87 win at the AT&T Center in game five.
Popovich's side bounced back after losing 4-3 to the Heat in the Finals in 2013, and the 65-year-old was full of admiration for how his players were able to overcome their disappointment to triumph this year.
"I've said many times, a day didn't go by where I didn't think about game six," Popovich told ESPN.
"So I think, just in general, for the group to have the fortitude that they showed to get back to this spot, I think speaks volumes about how they're constituted and what kind of fibre they have."
The Championship win was the fifth of Popovich's 18-year career with the Spurs.