John Williams was brought in to do that, didn't hear much about him and it didn't last very long.some clubs are able to negotiate great selling fees for their unwanted players.
The big issues are paying far too much for players and also the massive wages make them impossible to get a good fee for.
Some of the players city bought may look cheep 5/10 yeas later compared to today's prices, but so does Steve Daley now, and the recent big money signings like Mahrez and Rodri aren't value for money.