The first time I think was in one of the press conferences, the context was IIRC that he has gone abroad and done very well for himself, and the second time was just recently ahead of the Palace game where he said the following:
“Angel has been successful with England Under-17s, there with (Jadon)
Sancho, (Callum) Hudson-Odoi and (Phil) Foden, so, he has been a big part of that and I am definitely sure that if he gets the chance, he’ll do well.”
Edit: Just found the second quote, from the Burnley press conference
Q: A lot of talk about developing players, do you think you need to pay attention to that?
A: It’s something that you need to pay attention to. It’s a difficult gap, the gap from U18s until you get into the first team that gap there with players nowadays get a bit more impatient than before and they want to move earlier but what is the best pathway is a difficult one because some teams in the lower leagues don’t play the way you want them to play,
we’ve seen some players go to Germany to take the next step, Sancho’s a good example, goes to the Bundesliga then gets in the national team, is a different one. It’s not easy in the reserves, it’s hard, it’s a very difficult way and there are many hours spent finding a pathway.