Delays over Chelsea's manager search centres around Guus Hiddink's assistant.
The London Evening Standard says it is believed the delay has been caused by Chelsea's ongoing search for a No2 to work alongside Hiddink.
Marco van Basten is understood to be Hiddink's preferred choice in view of taking over in 12 months time.
But his agent Perry van Overeem said that "there has been no approach".
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