CHELSEA fans wondering what kind of manager Frank Lampard will be scrutinising how he led Derby last season.
Lampard is about to take over at Stamford Bridge from Maurizio Sarri and the chances are he will move a long way from the tactics employed by the Italian.
The 41-year-old wasted no time in trying to mould Derby into a side playing the kind of football he likes to see - and that has given a clear indication about how he will go about things back at Chelsea.
SunSport has taken a look at five things that stick out from his Rams reign which give hints about the way the Blues will play under their club legend.
BACK AND FORWARDS
For Lampard and his assistant Jody Morris, the full-backs are not just defenders they are offensive weapons, like Liverpool use Trent Alexander-Arnold and Andy Robertson.
Jayden Bogle was given licence to bomb forward down the right wing to join in with attacks, while Scott Malone was similarly employed on the left.
The pair provided genuine width in the Lampard game-plan, and that is likely to be the case at Chelsea where Cesar Azpilicueta and Emerson can become integral to the style of play.
It is a lung-busting position but the Blues have the players at their disposal, with Reece James and Marcos Alonso also available, to stick with those tactics.
Where Sarri-ball relied on playing Jorginho in the anchor role at the base of the midfield, Derby regularly played with two centrally.
Given the way the full-backs surge forward, one of the duo in the Rams midfield was more defensive to ensure they were not caught on the break.
So after a year of playing a more advanced role, it looks like being a move back for N'Golo Kante - this time alongside Jorginho.
Playing the pair in the middle allows them to maintain control in a vital area of the pitch and provide the impetus for attacks down either wings.
WORK UP A SWEAT
No-one at Derby was given a free pass last season - from centre-forward backwards they were all expected to work their socks off to ensure the high press was a success.
In the majority of matches where the Rams impressed, part of the secret was down to players chasing hard to close down opponents, make tackles and disrupt attacks.
That was as true for the ageing limbs of Tom Huddlestone, the fighting qualities of Bradley Johnson or the playmaking abilities of Mason Mount.
Lampard has seen that approach reap rewards for clubs like Manchester City and Liverpool, and he is likely to follow a similar route at Stamford Bridge.
GOOD ENOUGH, OLD ENOUGH
Lampard inherited a fairly strong squad with plenty of experience at Derby, but that didn't stop him throwing in the kids where he felt it necessary.
The Championship is an unforgiving league and the temptation is always to stick with players who are experienced and know how to get the job done.
But the boss made bright young prospects Mount and Harry Wilson central to his plans - trusting them to provide the creative impetus to launch a promotion challenge.
Eighteen-year-old Bogle was a revelation at right-back while Fikayo Tomori at in the heart of the defence was the club's player of the year.
There is plenty of experience still at Chelsea, but Lampard will not be frightened in freshening it up with some youthful talent.
TEAM TO FIT AN OCCASION
Having changed tactics, personnel and formation on several occasions last season, Lampard and his coaching team showed they are not so stuck in their ways they will not approach.
It is still a learning process for them all, but already Lampard has displayed a willingness to adapt his approach if it gives his side a better chance of winning a game.
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At times last season, Sarri was so belligerent in sticking with his tactics it cost his team points and left them exposed when everyone else could see what the problem was.
Lampard and Morris are now footballing novices, despite only a year in charge in the senior game and they will not hesitate to change things up mid-match if they can see something going wrong.
The likelihood is in the opening game at Manchester United they will go largely with the tried and tested - but don't be surprised if young faces are introduced if the situation demands.