Real Madrid's most promising striker Borja Mayoral is ready to sign a contract extension that will keep him with the club until the summer of 2021. He has big potential and some big clubs were ready to send an offer knowing his contract situation, so this is a great move for Real Madrid if Marca's report is accurate.
Mayoral had a great 2014-2015 season with Castilla but he is not fighting for the spot with Mariano Díaz, although it seems clear that Mayoral should develop into a good football player.
Mayoral should be patient enough to stay with Castilla the next couple of seasons so that he can develop his skills and then see if he has the quality to be a first-team player, no matter his role. It will be interesting to keep an eye on his development as he is still 18 years old. He will turn 19 next April.