This is the rumoured lineup...
---------------------Jones/Reina----------------------
------------Wisdom------Carra------Agger--------------
-Johnson--------------------------------------Enrique-
---------------------Allen------Gerrard----------------
--------------------------Sahin------------------------
--------------Suarez--------------Sterling--------------
i hate 3-5-2 it's only function is containment, which is awful. you can't play a fully functioning tactic with it imo. mainly because it becomes very difficult to do 2 things, 1) have effective possession; due to your width coming from 2 players instead of 4 meaning effectively you can only have good width in 1 area of the pitch instead of 2. you have 2 choices 1, your 'wing-backs' basically track the ball up and down the pitch, giving you width at each stage of your attack but they will obviously tire from all the running. this option would give you the best chance of keeping possession.
your 2nd choice is to have them go from 'full-back' to 'winger' as quickly at possible when you win the ball. for this to be in anyway effective you must play a lot of long, cross field passes which in high volumes become very risky due to how difficult they are. the 2nd option isn't something rodgers would like to see his team doing.
2) there is always without a doubt, going to be gaps everywhere with this formation. if you try and press high up the pitch, due to having only 2 wide players instead of the much better 4 your opponents always have an out ball. you sit off and your opponents full-backs get a free run 40 yards up the pitch or because your 'full-backs/wing-backs/wingers' are busy with their wingers, your CMs step across to help your poor, poor 'wide men' . well i suppose there is 1 other STUPID and AWFUL! option. you do the ridiculously risky thing where you go completely man-to-man with our 3 CBs against their front 3, wing-back against full-back DM against the 'number 10/inbetween the lines/ in the hole' and so forth. when you do stuff like that you end up defending all game. and if that is what we do, i hope to god we have got massively better at defending. so yeah 3-5-2 should go somewhere and die peacefully, and take it's place where it belongs in the annals of football. never to be seen again.
