Shocker's formation from a couple years ago is still generally correct, I would like to note some things though.
Firstly, does anyone know where/if one of the older PES formation creators are online (the ones with arrows)? I googled but could not find any - I just want to be thorough so that people who play with older versions can still enjoy the info.
4-5-1 is the modus operandi for Unai Emery's Sevilla, it is the consistent framework no matter what the situation or match (The 2015 super cup vs Barca, 5 first-team players were out with food poisoning, Emery still forced players into the formation, rather than change the shape), only slight tinkering of one or two players positions might happen from match-to-match or during a game for a tactical effect, it is this consistency and familiarity of the system that bestows Sevilla good success in recent years despite being a stepping-stone (i.e. selling) club.
The team has a few phases/variations that they cycle through depending on context;
Defense Phase: Variation I (Movement as a block, light pressing aimed to filter the ball out as opponents try to breach the block. *AMF* in this phase is usually Banega, and if protecting a lead will be a CMF in his behaviour and deepness, used to clog up the middle, just in front of the DMFs. This can be considered the standard Sevilla defense style.)
--------------GK------------
-----RB---CB---CB---LB---
---RMF--DMF-DMF--LMF-
------------*AMF*----------
--------------CF------------
-----------------------------
-----------------------------
Defense Phase: Variation II (A press high-up the pitch, when behind and especially if the opposition is trying to keep the ball deep, aim is clear, win ball counter attack with speed. This is what makes Sevilla dangerous at home for big sides, few teams can handle the counterattack, it's quick, penetrating and almost always decisive.)
--------------GK------------
----------CB------CB-------
-------------DMF------------
-RB-----DMF--AMF-----LB-
-----RMF----------LMF-----
--------------CF------------
-----------------------------
Possession Phase I (one of the holding midfielders becomes a "free" CMF* that has licence to roam higher up the pitch, sometimes they rotate which is free but generally Krychowiak is the covering DMF (a constant in the team), with M'bia/N'zonzi/Iborra/Khrone-Dehli/Banega being the possible midfield partner allowed to be free. If Iborra is played at *AMF, he can be considered an SS and used as a quick release of the ball from deep, due to his height he wins almost all aerial balls, the CF buzzes around him or into the channels. IF Banega is AMF he will drop to connect play or thread wingers into space.)
-------------GK------------
-----CB-------------CB----
RB---------DMF---------LB
------------CMF*------------
RMF--------------------LMF
-------------*AMF-----------
--------------CF------------
Possession Phase II (3 man back line, DMF moving freely to offer a passing option, to either cycle possession or start plays from deep, CMF operates from the center circle connecting play but can show up anywhere as he engages in a lot of lateral movement, SMFs move into the centre to create rather than looking to put in a cross, though they still are free to overload a flank if the oppositions defense becomes stretched.)
-------------GK--------------
-CB--------DMF---------CB-
------------------------------
------------CMF-------------
RB---------AMF----------LB
------RMF--------LMF------
-------------CF--------------
Possession Phase III (Only Banega as AMF will drop super deep (beside CBs) and look to connect plays or thread players in on the overload at the front. DMF covers for absent SBs and plays as a pseudo SB helping to cycle possession. CMF (M'bia/N'zonzi/Iborra) have freedom to get into the box aggressively and offer their height as a danger. SMFs and SBs combine regularly, not unusual for SMF to play in a SB who squares the ball for CF but other SB is also waiting for the cross.)
-------------GK--------------
------------------------------
------CB------------CB------
-(DMF)----AMF-----(DMF)-
------------CMF----------
RB---RMF-------LMF-----LB
-------------CF--------------
Starting XI 2015/2016:------------Sergio Rico
--------Rami----Kolodziejczak
Coke(v.C)--------------------Tremoulinas
-------N'zonzi--Krychowiak(3rd C)
--Reyes(C)-----Banega------Vitolo
--------------Gameiro
SFK/LFK/LCK/RCK: Banega (mainly him, but Reyes, Konoplyanka might do it just as much)
Some of this is up in the air due to injuries (Beto is out long term) and suspensions that seems to give a different CB pair every week, Reyes is not really a starter and if he does he rarely finishes a match, if Konoplyanka plays then Vitolo moves to the right, Coke and Mariano can be interchangeable (Coke is an option at CB).
Notice how much of a French presence this team has (Krychowiak is a Bordeaux youth product). And Emery seems to have a predilection for tall players: Rico (195 cm), N'zonzi (196), Iborra (195), Llorente (195), Rami (190), Fazio (195) ...