CIES has released an article (link at the bottom) analysing the 42 clubs who have been ever present in the top 5 leagues across Europe over the last decade.
This is the results for "number of minutes played by club trained players -
Some would say that's pretty embarrassing for a club who have invested so much in the academy, drummed up so much press about it, and whose CEO constantly talks up how important academy players are to the clubs' plans.
Rest of the article is here -
https://football-observatory.com/IMG/sites/mr/mr50/en/
This is the results for "number of minutes played by club trained players -
Some would say that's pretty embarrassing for a club who have invested so much in the academy, drummed up so much press about it, and whose CEO constantly talks up how important academy players are to the clubs' plans.
Rest of the article is here -
https://football-observatory.com/IMG/sites/mr/mr50/en/