Gary Cahill's future at Chelsea is in doubt.
The England defender has been missing for recent games, with Kurt Zouma preferred by Blues boss Jose Mourinho.
The Daily Mail says discussions have already taken place that could shift Branislav Ivanovic into his preferred position at centre back alongside captain John Terry as part of a defensive reshuffle.
Cesar Azpilicueta has been earmarked for a role at right back, also his orthodox position, to finally find room for the £16m left back Filipe Luis in a modified back four.
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