This makes pretty grim reading
https://www.bbc.co.uk/sport/football/articles/cn081g8x520o
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I think all of that will be from Armstrong. It's not like we're flogging players to other teams either, as only really Gordon fits into that camp.
Palace 3,175 minutes (2760 of them are Tyriek Mitchel 415 Nathaniel Clyne-who they sold and bought back)
Brighton 3846 (2565 minutes Lewis Dunk 1254 minutes are Jack Hinshelwood)
Fulham 2777 minutes (Sessegnon 1591 minutes - sold and bought back, King 1186 minutes (fair enough)
Wolves 3243 minutes (Mane 1311 minutes (fair enough)
Liverpool have been high on these lists last 5 years basically down to Alexander Arnold & Curtis jones, you take one player out and it gets scewed massively.
Our acadamy is no worse than any of these others mentioned apart from obviously City & Chelsea's