In Pro Evolution Soccer's Master League Mode, gamers will encounter fictional young players often called 'Master League Youths' by PES devotees. In older versions of the game (before PES 2010), these players appeared as 17-year-old "newcomers" during the winter transfer window. In newer versions (PES 2010-onwards) these players often pop up in the player's Youth Team.
The majority are often claimed to be impressive developers, with overall ratings plateauing between 85 and 95. Throughout the Pro Evolution Soccer series, new Master League Youths are added and removed in each edition of the series, and in some cases youths have been moved into the Master League Defaults.
 PES 2010
PES 2010 was the first edition to include youth teams. Every club had a youth team where these Master League Youth players would feature in. The first season your youth team will comprise of some of the Master League Default Players. Then from the second season onwards, Master League Youth players will appear.
You can sign players from your youth team at any time, however if you choose to sign a player outside of the transfer window, they will join at the next available date.
The better youth team facilities you have, the better players you can produce. On the rare occasion you will find a world class player that can fit straight into your team.
 PES 2012
As usual, Palmieri and Shimizu feature in the youth team as being some of the better players. It is highly recommended to sign both of these players if using the Master League Default Players as they rank miles better than the rest.
Palmieri is a young Italian centre back. Despite being a relatively slow defender, he does have 80 Defence and 76 Header Accuracy so he can form a strong back-line for your team. He is also very young so he has plenty of time to develop into a very good player.
Shimizu is a Japanese winger. He has the highest overall rating when starting the game in the youth team with 77. He is highly recommended for any team due to his pace and fast dribbling. Furthermore, he is considered to be both footed which can be useful for your side. He is however very small.
Recent examples of Master League Youths drafted to the Master League Default team include El Moubarki and Gutierrez. Along with Master League Youths, players who retire at the end of a season, will 're-generate' during the mid-season transfer window of the following season, as a 17-year-old like the Youths. These players however keep their original name, and often follow a similar development curve to that of their pre-retired state.
Many PES fans see the Master League Youths, as a great addition to the series, and Youths such as Schwarz, Bos, Shimizu, Chapi, Orellano and Kaiser have received a legend like status with PES fans.
These players have appeared in one or more editions of the game.