A midfield diamond would be great
DDG
Rafael-Evans-Rojo-Shaw
Carrick
Herrera Di Maria
Mata
Rooney Van Perise
This would be perfect as it is a balanced team whilst solving the fitting in the best players conundrum.
The problem with a midfield diamond is that it can be too narrow and if the opposition floods the middle, it can stifle the team. This is where Herrera and Di Maria come in.
Carrick- Plays a role similar to what Busquets does for Barca. Effectively sits back and screens the defence, while his prime responsibility possesion-wise is to recycle and retain the ball, his passing range allows him to start off promising attacks whenever he sees fit. I know he is 32 and coming back from an injury but he is a player in the mould of Pirlo, Busquets Scholes and Alonso who rather depend on their technical qualities and intelligence rather than their physical attributes. Whilst he could be overrun if not provided ample support like last season, that won't be the case with Di Maria and Herrera in front of him. These two little buggers run non-stop and provide the athletic support that relieves Carrick of his defensive burden to a large extent and allows him to flourish in a deeper role. He may not be a midfield terrier but his intelligent positioning and reading of the game means he would rather be looking at intercepting the ball and stopping the attacks before they take shape whilst leaving the vigorous closing down and tackling to the much energetic Herrera and Di Maria to a certain extent.
Herrera- Full of energy and is a willing runner who is qually adept at defensive and offensive contributions. His workrate, tenacity and desire is phenomenal while his touch, link-up play and incisive passing heavily contributes to the drive and tempo of the team's offensive game. He is like midfield terrier with his closing down and tackling who can also significantly contribute offensively and is perfect at playing this role. His mobility means he can also venture out to the right flank when necessary to provide ample width and support for Rafael as well. He will be the more defensive relative to Di Maria in this formation, holding the fort when Di Maria rampages forward so as not to get caught out by opposition's counter attacks. He will naturally be more adventurous in games in which we dominate possession.
Di Maria- Somewhat similar to Herrera but is more cultured technically and offensively whilst being less refined defensively. He would be tasked with attacking the left hand channel whenever he gets the opportunity, similar to how he did with Real Madrid. He would also be tasked with providing much needed pace, drive and verve to our rather static attacking play with our three forwards requiring runners/link-up play to truly function as a forward line. Herrera would also provide forward runs when necessary but he will naturally be slightly more refrained with his forward runs to provide Di Maria with the necessary freedom to excel.
Rafael & Shaw- These guys have all the tools necessary to become excellent wing-backs and will be crucial in this formation to providing the width and stretching of play. Rafael is truly adventurous offensively and always looks to burst forward to support whenever he can. He can link-up well with forwards and provide excellent width as well. Herrera will venture to the right flank whenver possible to cover for Rafael or to provide support for him as we. Same goes for Di Maria and Shaw as well. He is not so solid defensively and can rather be rash but with experience he can improve and will only become better. Shaw always looks to provide an outlet when attacking and looks to carry the ball forward whenever he can, but he is not great offensively and has to improve his game in this regard. He has looked rather tentative and reserved in pre-season but he has all the tools necessary to become an excellent attacking wing-back. However, he is very good defensively and is also very consistent which would naturally allow him to focus on developing the attacking aspect of his game faster as he has the defensive fundamentals for a full back.
Forwards- I don't need to say much about the forwards, they are all quality players who just need good service from the deep. Not only that, they also need willing runners and link-up play to fully utilize their games to their fullest capabilities. These 3 players are not great when it comes to pace, dribbling or stretching of defences and thus are rather predictable when receiving square, short passes in crowded areas. They won't receive a routine pass and dribble pass 4 players and put in the top corner or pluck out a miraculous pass from out of nowhere. Whenever they receive the ball, opponents tend to press them in the knowledge that they are incapable of dribbling and this results in them just passing backwards. With the likes of Herrera, Di Maria, Rafael and Shaw in the team they will have what they need to play the game their way and would truly excel in doing so.