Gael Kakuta is one of the 26 players at the club currently out on loan from Chelsea. He has followed up spells with the likes of Fulham, Bolton, Dijon, Vitesse and Lazio with a spell at La Liga club Rayo Vallecano.
Kakuta was a controversial signing for the club, which saw them cited for an illegal approach and looking like facing a transfer ban. But he has not pulled on a Chelsea shirt in anger since January 2011, so has to show what he is capable of whilst on his current loan spell.
At the moment he is at Rayo Vallecano, and will take part in a Madrid Derby against Real Madrid this weekend - currently the best team in Europe.
Which will see him go face-to-face with a couple of former coaches.
Carlo Ancelotti actually gave Kakuta his debut in the Chelsea team back in November 2009 - five years ago now.
While the Real Madrid assistant Paul Clement was the coach of the Chelsea youth team, in which Kakuta played at the time, so it will be a very special occasion for him on Saturday at a sold out Santiago Bernabeu.
This week he has been speaking to Marca about the pair, having glowing reviews from their time together at Chelsea:
"As well as Ancelotti, who gave me my debut, I also learnt a lot from his assistant, Paul Clement, who was my coach in the youth team. It will be lovely to see them both again. It was very special because it was my first game at professional level. I will never forget that it was Carlo Ancelotti who brought me on for the first time."
Kakuta will however be hoping to put a grim look on his old bosses faces as he aims to continue his good form with Rayo.