Thomas Tuchel’s half-time change against Barnsley could provide a clue as to how Chelsea will operate in the future.
The Blues made it through to the FA Cup quarter-final with Tammy Abraham’s goal proving enough to knockout Championship outfit Barnsley.
Chelsea struggled in the first-half at Oakwell with Tuchel having made ten changes from the weekend win over Sheffield United.
Tuchel had picked Andreas Christensen, Kurt Zouma and Emerson as his defence with Marcos Alonso and Callum Hudson-Odoi as wing-backs.
Though it changed to a back four at the break with Antonio Rudiger replacing Christensen and Reece James coming on in place of Alonso.
It saw Emerson shift to left back with James slotting in on the right side of defence and Chelsea looked much more assured.
And having seen the success with four at the back, Tuchel may wish to stick to that tactic in the Premier League.
Though he admitted it was a forced change, saying: "We changed to a back four and took Marcos [Alonso] out for this tactical change.
"Andreas [Christensen] had to go out because he had a headache. The changes made it a little easier to get into the opponents half and overcome the first press.
“We scored a very nice goal but after that the opponent took a lot of risks, played aggressive.
“We struggled to cope with the first challenges, struggled with the second balls.
“We were lucky twice. Kepa saved us in the first half and Tammy saved us in the second. We struggled today but in the Cup it's sometimes like this. I don't want to be too hard on the guys.
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“I’ve said before that we can not expect too much of ourselves. We have to cope with the quality of the opponent, the fact we were clear favourites and they had nothing to use.
“We arrive here with many changes and we lack a bit of rhythm and confidence. We can clearly do better but I don't want to judge everybody too harshly.”
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