To borrow a phrase from Lisandro Martinez, we expect more from him.We expect more from a vastly experienced defender and World Cup winner. We expect more from a 28-year-old whose team-mates during a stellar career include Lionel Messi and Cristiano Ronaldo.We expect more from Martinez than to fling an arm into the face of an opponent in the penalty box a matter of seconds after being booked for another offence with such a crucial game hanging in the balance.How did he think he was going to get away with it? How did he think it was going to help Manchester United’s chances of staying out of the relegation zone or Michael Carrick’s prospects of keeping his job?Just when Carrick needed cool heads among his senior players, Martinez went and lost his.No sooner had his arm connected with Wesley Fofana than VAR official James Bell sent referee Peter Bankes to the monitor. A second yellow card followed and a penalty for Cole Palmer to convert Chelsea’s second goal. Game over. When Michael Carrick needed cool heads, Lisandro Martinez (right) went and lost his He finds himself at the scene of the crime too often and his time at the club appears to be coming to an endThere was no way back for United from there, not in their current fragile state.Carrick couldn’t say what he really thought of Martinez’s moment of madness, but legendary United goalkeeper Peter Schmeichel did it for him.’I put this solely on Lisandro Martinez’s shoulders,’ fumed Schmeichel. ‘This is an absolute disgrace how he played this game. The penalty, I have no words for how crazy that was. Then he walks off the pitch shaking his head like he’s done nothing wrong. So bad.’This is the same Martinez who landed himself with a club fine earlier this month for saying he expected more of United’s director of football Jason Wilcox in the transfer market last summer.The same Martinez who scored a hapless own-goal down the road from Chelsea at Fulham in September. The same Martinez who turned his back on the ball against Tottenham a week earlier, and allowed Dominic Solanke to score a late equaliser at Old Trafford.With his contract running out in June, and no sign of United intending to trigger a 12-month extension clause, it looks as though his time at United is coming to an end and not in the way he would have wanted.‘Whatever the next Man United phase is, I think Martinez’s time at the club has run its course,’ Joe Cole told TNT Sports. ‘In a Man United shirt, he’s just at the scene of the crime too often.’No doubt Martinez’s resentment over his contract situation played a part in his comment about Wilcox. While supporters have applauded him for calling out the club’s recruitment – and there is no doubt he has a point – his time would be better spent focussing on keeping the ball out of United’s net and keeping himself on the pitch rather than pointing the finger at others.He has been one of United’s better signings of recent years, albeit one hampered by a succession of unfortunate injuries. The combative edge and winning mentality he brought from his time with Argentina and Ajax have been an asset to Erik ten Hag, Ruben Amorim and, to a lesser extent, Carrick. Michael Carrick (left) could not say what he really thought but was let down by one of his more senior playersThe fans love The Butcher and you can see why at a time when so many players who have passed through the doors during his five years at Old Trafford have failed to show enough heart for the fightBut this was a stupid, selfish act borne out of frustration which cost United any chance of winning this game and will keep Martinez out of United’s last fixture before the international break at home to Aston Villa next weekend.By the time they return to action, there is no guarantee Carrick will still be in a job.Carrick’s losing marginal gamesIf you want to compare Michael Carrick’s successful spell in charge at United last season with the seemingly inexplicable drop-off this term, this was exactly the kind of marginal game that he was winning back then.Think of Carrick’s first two matches in charge against Manchester City and Arsenal, and the 3-2 wins over Liverpool, Nottingham Forest and Fulham. Perhaps most relevant of all, the 1-0 win here over Chelsea in April when Matheus Cunha scored the only goal just before half-time.If United had taken only half their chances in the first half at Stamford Bridge this time, they could have put the game to bed. Amad Diallo had enough of them to win it on his own.It would be easy to say that Carrick’s luck has run out but it isn’t that easy in elite sport. The confidence that flowed through the team in those months between January and May has drained from his players. Chances are being missed, silly goals conceded. Experienced campaigners like Martinez are suffering from a rush of blood to the head, and every mistake is being punished. That’s what happens when the tide turns and you haven’t got the resilience to ride it out.Every game looks hard for United at the moment. Their only victories this season have been at home to Sabah and Ipswich, and even the latter came with a slice of luck.Who knows where their next win is coming from? As he left West London looking rather dazed, Carrick didn’t seem like a man who has the answer to that question. It feels like Bruno Fernandes’s great Manchester United career may be coming to an endFernandes return falls flatOnce we knew Carrick would be in the dugout at Stamford Bridge, all the talk in the build-up to this game was about the return of captain Bruno Fernandes after he was dropped for last weekend’s defeat to Bournemouth.Fernandes didn’t just come back into the line-up, he was back at No10 after vacating that role for Youri Tielemans in recent weeks. Tielemans was deservedly left on the bench here while Fernandes interchanged with Cunha in a fluid United attack that performed well in a promising first half.But the Fernandes of old would have made his mark on this game. Got a goal or an assist to lead his team to victory and ram the taunts of rival fans down their throats.But he did nothing of the sort. Too many passes went astray, too often the arms were thrown up in the air in frustration. When he had a great chance to put United ahead in the first half from Bryan Mbeumo’s brilliant pass, Fernandes blazed it over the bar.One man can’t carry an entire team, but the Portugal star has come close to it at times during his seven-year career at Old Trafford. Here, though, was more evidence that his powers may be fading and this United team may be beyond help.United were open to selling Fernandes to Al-Hilal last year and won’t break the bank to keep him when his current deal runs out in June. They might renew at the right price or at least trigger the 12-month option to make sure he doesn’t leave on a free transfer.But it feels like a great United career may be coming to an end.