text: Kurt Zouma was deployed in a defensive midfield role against Manchester United specifically to stop  Marouane Fellaini from continuing his good form at Stamford Bridge, according to Jose Mourinho. The big Belgian has shone under Louis van Gaal in recent weeks but he endured an evening to forget as the 20-year-old man-marked  him superbly during the Blues' 1-0 victory. Mourinho gave an insight into his instructions to Zouma after the game, explaining that he'd asked the young Frenchman to turn the match into a '10 against 10' clash. Chelsea's Kurt Zouma tussles with Marouane Fellaini during his side's 1-0 win against Manchester United . Zouma was deployed in a defensive midfield role so that he could deal with the threat of United star Fellaini . Speaking to chelseafc.com after the final whistle, Mourinho said: 'I told Zouma I want the game to be 10 against 10, I didn't want the game to be 11 against 11. 'During the week we were working for that and the game was 10 against 10.' Zouma, who also played in midfield away at West Ham and in the Capital One Cup final against Tottenham, was pleased with the job he did against the 'on fire' ex-Everton man. He said: 'I had to stay with [Marouane] Fellaini because we knew he is on fire at the moment. 'He has scored a lot of goals so I had to keep an eye on him, and I think I did it well. I had to be physical with him and stay close to him. 'The game was very difficult. The most important thing was that we had one chance and we scored. We defended very well. Manchester United didn't have many chances to score. We stayed compact.' Zouma wrestles Fellaini to the ground as Chelsea continued their bid for a fourth Premier League title . Fellaini has been in excellent form but he was unable to impact the game with Zouma watching his every move . Mourinho was similarly impressed with the performance of the former Saint-Etienne starlet, adding: 'See the jobs he is doing for us, as a central defender playing against [Sergio] Aguero, as a central defender playing against [Raheem] Sterling. 'He played as the holding midfield player against Tottenham in a system with only one holding midfield player. 'Against Man United he played to stop Fellaini from playing in the box. He is doing amazing jobs for us. He is mentally very, very strong, too. Not just physically, mentally he is very strong. 'He's learned a lot from a tactical point of view since his arrival. So we can imagine with him being aged 20, Chelsea has 10 years of Zouma.' Jose Mourinho believes that Zouma could play for Chelsea for at least the next 10 years .
target: Kurt Zouma kept an eye on Marouane Fellaini during Chelsea's 1-0 win .
  The French defender played as a defensive midfielder against Man United .
  Jose Mourinho wanted the 20-year-old to keep Fellaini out of the game .
  Chelsea boss impressed with Zouma's form during first season at the club .
  READ: Mourinho critics don't have leg to stand on as he is getting job done .