Chelsea is fortunate to be one of Europe's deepest squads with lots of options at nearly every position.
Branislav Ivanovic should start on the right side even if Azpilicueta is brought in. His size and physicality makes him the preferred option initially.
Gary Cahill may replace David Luiz in the middle, especially if the Brazilian has another poor first half, but Luiz played his best football under Di Matteo last season.
Mikel has frustrated fans in the past with his inability to create that killer release, but has really grown in the past year.
He is solid defensively, has great feet and does well to win the ball as the holding midfielder. His pass completion rate also makes him the best option as the deep pivot.
Frank Lampard will struggle to start every match, despite thinking that he's still in his mid-20s. Raul Meireles will spell him often as well as Michael Essien—if he remains at the club.
Ramires may be moved back as the second pivot, but that would limit his usefulness. His composure on the ball and quickness make him a very dangerous weapon on the counterattack.
The midfielder also adds a solid defensive presence on the right side that was seen, but underappreciated against Barcelona in the Champions League last season.