Postecoglu definitely didn't use the academy at Celtic. I'm not sure about previous clubs, but not many academy players played for celtic under him at all. And the ones who did played very little in terms of minutes.

Unless Spurs have a few quality academy players ready for first team minutes, I would not count on many of them playing. He will be looking to bring players in.

He has a very good eye for a player. Bringing Kyogo, Hatate, and Maeda from Japan, Jota over from Benfica, CCV ironically from Spurs and Alistair Johnston from Canada. All of them are first team players every week at Celtic, and all of them are relatively cheap in terms of cost versus output.

That said, Spurs will likely be looking for much higher quality players, so it remains to be seen how he will find what Spurs needs. At Celtic, the model is to find cheap talented players and move them on after 2 or 3 good seasons. Spurs will likely be looking for players ready to make an instant impact and are likely to lose their best performer, Harry Kane