Each season I grow 3 players from Youth Academy, 3 with 7* and sometimes new role and special ability. 1 to 3 by auctions: 2 high quality and old age, and 1 average quality and young. I take them After 5th day. Other players from auction after 20th day if I pay at least 4 token and they are younger than 21 years.
Never from scout or negotiation, Sometimes from assistant I look interesting players but too token and I prefer YA