By the end of a shameful, shambolic evening for Manchester United, the MK Dons fans were crowing “you’re not famous any more”. United are not frightening any more, not organised any more, not confident any more. United are certainly not in the Capital One Cup any more. They are out before Manchester City are even in. This will be remembered by United as the game of shame, a game when their followers turned up in huge numbers but their players didn’t. Mistakes and timidity could almost be forgiven in youngsters like Michael Keane but not in experienced campaigners like Jonny Evans, the captain whose lack of concentration contributed to this calamity. United had five full internationals starting, Adnan Januzaj coming on and resembled a mediocre collection of strangers who shamed the shirt. Louis van Gaal blithely signed autographs after the final whistle, keeping Karl Robinson waiting for the post-match hand-shake, but this defeat should hurt. Scorelines like this damage the Dutchman’s authority. He seemed to be using the League Cup as a shop window for the likes of Javier Hernandez, Danny Welbeck, Anderson and Shinji Kagawa, all of whom saw their value drop further. Van Gaal also effectively gave trials for the likes of Keane, Reece James, Marnik Vermijl, Saidy Janko and Nick Powell. The mix was wrong. Van Gaal showed no respect to the competition and was punished. It was not as if he needed to rest players for Europe. Mistake. Van Gaal is a coach of great distinction and achievement but performances like this undermine the credibility of his 3-5-2 system which needs abandoning sharpish. He has a major rebuilding job to do, the work starting with the purchase of Ángel Di María but also needing strengthening in defence and midfield. So much work is required. United were woeful defensively, insipid in midfield and blunt in attack. The only defiance shown by those in red were standing behind one goal. United supporters sang endlessly, raising the volume as the scoreboard charted their team’s demise, as the goals flew in from Will Grigg twice and the substitute Benik Afobe twice. Some of Karl Robinson’s players are United fans and this desire to show their own abilities to vaunted guests shone through their efforts. Robinson looked on, enjoying the spectacle while Van Gaal never moved from his dug-out. During his seven years as an Academy coach at Liverpool, Robinson must have dreamed of moments like this, masterminding a defeat of United. This was no fluke. Robinson’s side were more organised, more determined and calmer in possession. Dele Alli was superb, showing all the hunger lacking in the contributions of Powell and Anderson. David Martin had little to do in goal but saved well from James Wilson. Ben Reeves, who created three of the goals, also excelled for MK Dons. So a club that did not exist a decade ago humiliated opponents who were European champions six years ago. A team with a wage-bill of £3 million outplayed visitors whose annual dressing-room income touches £180 million. United were much-changed, and have big stars to return, but this will still go down as one of the great Cup upsets. This will also mean so much for MK Dons as a club, more in prestige than simply revenue; the locals know they have a good footballing side to watch, rising stars like Alli to admire and a young manager in Robinson, only 33, creating a fine reputation for himself and his team. Not including the spectators in United’s defence, Stadium:mk contained 26,969 onlookers. Probably sensing a quick buck more than the eventual upset, touts gathered early outside, feeding on interest in a sold-out game the hosts reckoned they could have sold 50,000 tickets for. Two kids walked slowly from the club reception, looking crestfallen on being told that there were no tickets left. “You’re breaking hearts,’’ one receptionist whispered to another. It was soon United hearts being broken. Leaving the away dressing-room, Van Gaal’s players had congregated in the tunnel, before a huge sign saying “Welcome to the Jungle”. The ambush was set. Robinson’s players pressed Van Gaal’s relentlessly. When Vermijl stroked the ball across to Evans after 24 minutes, Reeves slid in, nicking the ball and then knocking it across to Grigg. On loan from Brentford, Griggs calmly stroked the ball from right to left past David De Gea. It was dreadful defending by Evans but also indicative of United players’ unease with the 3-5-2 system of Van Gaal’s, a formation that can leave broad avenues of space between the centre-halves. “You’re getting sacked in the morning,’’ sang the MK Dons fans towards Van Gaal. They were soon chanting olé when Samir Carruthers’ snap-shot was saved by De Gea and also during a neat passing move orchestrated by Alli. The tall teenager was dropping deep, partly keeping an eye on Januzaj, who had replaced the concussed Kagawa, but also picking up the ball off his centre-halves, building moves. Robinson’s side simply wanted it more. There was no urgency to United, perhaps affronted to find themselves playing in the second round of the League Cup for the first time in 19 years, because of their failure to qualify for Europe. Only Welbeck briefly seemed determined to fight against the incipient embarrassment. Van Gaal removed Janko at the break, sending on Andreas Pereira, who promptly curled a free-kick wide. Van Gaal then took off Powell, unleashing Wilson. Welbeck seemed inspired by the greater numbers in attack, firing a shot just wide. It was a false dawn. United’s back-three fell apart again after 62 minutes. As Anderson jogged back, Keane was caught out by Reeves, the cross came in, with Evans nowhere. Anderson decided not to track Grigg, who coolly chested the ball past De Gea to send MK Dons into dreamland. Seven minutes later, they were hurtling into the third round, courtesy of Afobe, a forward on loan from Arsenal. Released by Reeves, Afobe ran through and fired the ball past De Gea. With six minutes remaining, and United fans now deafening in their defiance, MK Dons simply added a fourth. Afobe charged through, skittling defenders, shrugging off Keane twice, Evans and Pereira before placing the ball expertly past De Gea. After the final whistle rang out to end United’s misery, the MK DJ played some Oasis, those City favourites. United will certainly look back in anger on this. MK Dons will just reflect with justifiable pride.