Manchester United manager Michael Carrick has revealed why Lisandro Martinez was substitute at half-time against Leeds.Martinez started for United at Elland Road just days after he launched an angry outburst towards the club’s board.Carrick started for Man United a few days after his outburst, but was substituted at half time against LeedsGettyThe Argentinian centre-back slammed their recruitment after a 2-0 defeat in the Champions League to Atletico Madrid. But Carrick admitted on Friday that the drama following Martinez’s comments was ‘done’ and that he was available for selection.He went on to start against Leeds for the Red Devils and kept a clean sheet in the first half, as his side went in 1-0 up.Bryan Mbeumo‘s goal was the difference and United looked to be on the top, leading their rivals as the whistle blew. However, when coming back out for the second half, Martinez didn’t return to the pitch, sitting on the bench instead.Carrick replaced the defender with Noussair Mazraoui, with Leeds going on to score an equaliser as the game ended 1-1. Why did Carrick substitute Martinez? Speaking post-match, Man United boss Carrick explained the reasoning behind Martinez’s half-time withdrawal.He said: “He felt his thigh a little bit.”Martinez had been spotted hobbling during the first half.He could potentially now be a doubt for United’s Champions League trip to Como on Wednesday, which will be live on talkSPORT 2.Carrick has revealed why he took Martinez off at the break after his side drew 1-1 at Elland RoadAFPMartinez’s angry outburstMartinez, who has started eight games in all competitions for Man United this season, avoided a ban for his comments. He was reportedly fined for the outburst, but Carrick was clearly happy enough to keep him in his team on Sunday. The 28-year-old targeted United’s technical director Jason Wilcox in his rant, which he went on to apologise for.“I have to control myself a lot,” Martinez said on Tuesday. “But sometimes it’s a reflection of our club at the moment. We did it last season and now we expect more from the top.“To bring more players, to compete. Other teams bring in many more players. I expect more from everyone… 100 per cent I expected more from our technical director.“I have to be honest and also the players have to do more but it’s just important when you make a strong squad for this type of night.”Martinez was fined by United for his comments about the club on Tuesday, but he started for them again on SundayGettyOn whether Carrick has not been backed enough, he added: “I don’t think so. He does his best. The team knows how you play, every detail and if you don’t change the next season, it’s a big problem.“You start changing, changing, changing manager, but what about other areas. I can’t say more. “It’s easy to say the players but also we have to see other areas.”