Thomas Tuchel's long-term tactical changes at Chelsea didn't really go far beyond playing three at the back. It was a radical move at the time having spent the large part of two and a half seasons with a rigid 4-3-3, though a back three was used on occasion under Frank Lampard.
From the get go it showed the tactical chameleon that the German had become known as. His use of Callum Hudson-Odoi as a wing-back and Cesar Azpilicueta being moved to centre-back once more was inspired and saw a massive upturn in results.
For Tuchel, there wasn't much more to follow in terms of consistent trends of tactical moves. Sometimes he moved from 3-4-3 to a 3-5-2, other times there was a more expressive 4-2-2-2 sprinkled in. Movements between the forwards shifted from a 3-4-1-2 into a 3-4-2-1 but that was really the limit on the large part.
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It was something that played into his largely risk averse time at Stamford Bridge and in general, not too much was built on from the early radical changes. There was some wing-back play with Reece James and Ben Chilwell occupying central areas but really, considering his stature as a flexible and expansive coach, not too much was evident at Chelsea.
Graham Potter comes to the club with similar expectations. Although he too favours a 3-5-2 of sorts he is a manager that switches system commonly and does it at the flick of a switch in games to overcome obstacles and set traps for the opposition.
This was evident against RB Salzburg with his use of Raheem Sterling as a wide player and Mason Mount's positional move. From that game there were a few tactical takeaways, but here, football.london takes a look at who else might be moulded differently under Potter at Chelsea and where we might see them in the coming weeks.
Raheem Sterling
To start with maybe the most drastic change from Tuchel's Chelsea, not only did Sterling play much wider than his central role in the early stages of the season, he was the highest player on the pitch too, standing right along the last line of defence.
To describe it as a wing-back is pushing the boundaries, but if you were to draw a symmetrical shape on paper for the system then Sterling would be the left sided player, opposite James. Football isn't symmetrical, neither are formations and Potter certainly isn't. Sterling was a true winger and Marc Cucurella had his own left-sided centre-back, wing-back and midfield space to operate in with Sterling's position opening up freedom.
Using attackers as more orthodox wing-backs is something that Tuchel did with Hakim Ziyech and Christian Pulisic - more on them later - and Potter also did it with Solly March and Leandro Trossard. Although Sterling is likely to receive the ball higher up for Chelsea than Brighton's attackers, it may not be uncommon to see him in that spot more often in the future.
Ruben Loftus-Cheek
Loftus-Cheek is Chelsea's Mr Utility right now. This season alone he has played at right wing-back, right wing, central midfield as an eight and a six and also on his own as a defensive midfielder. His physical frame and excellent ball skills make him a perfect option for a variety of positions.
One place that he was used more sparingly last season was as a centre-back. In Chelsea's FA Cup match against Luton Town Tuchel surprised everyone with the move to put Loftus-Cheek in defence. It just about worked. Although Potter now has more defensive options available to him it might not be unreasonable to suggest he could fill in if needed.
This becomes especially relevant when considering the deep role that Jorginho played against Salzburg. At times the Italian was part of the defence on the ball to get position, if Loftus-Cheek is used in a similar way then his frame would allow him to slot in easier when possession was lost.
Mason Mount
Often talked about has been Mount's role under Tuchel. His delivery of more than 10 goals and 10 assists last season was a brilliant set of numbers even if his overall performances weren't always as consistent as the previous campaign, and it was largely out of position.
Mount was moved into the front three as an inside No.10 under Tuchel and played well in the role but, as proved by his all action performance against Salzburg, being a midfield No.8 is much more natural and gets the best from his energy and pressing.
Mount could also be used in behind a striker in a 4-2-3-1 if Potter was to use that.
Kai Havertz
Where is the best position for Havertz? Nobody knows the answer but everyone has their ideas. Potter has the choice to use him as a striker, false nine, No.10 and even a wide forward this season.
Havertz has already been shunted around by Frank Lampard as a deeper midfielder and winger but Potter is more likely to keep him in attack - it could yet be in a new role again, though.
Playing as a traditional No.10 behind the striker is not something that we have seen much of from Havertz and now, with both Pierre-Emerick Aubameyang and Armando Broja capable of being a focal point, he might get that chance.
Christian Pulisic
If Sterling can benefit from being high and wide as a wing-back then there's every chance Pulisic might be used in the role as well. He was previously deployed by Tuchel in that position but given the advanced nature of Sterling it might be to more use under the new manager.
Hakim Ziyech
Just like Pulisic, Ziyech has been a makeshift wing-back before . Interestingly though, at Brighton Potter favoured switching flanks for his attackers when moved into the position. March, who is left footed, was played on the right in order to cut inside whilst Trossard was used on the left.
This would mean that Ziyech, who favours the right wing, could become a choice for James' attacking wing-back spot if needed. This would also allow James to come inside the pitch in a position he is used to anyway.
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