The Daily Mail says Abramovich, who went through a spell of missing matches under Mourinho, has gone to extraordinary lengths to protect his own safety as he aims to show his support for his new appointment.
He will be surrounded by bodyguards and Hull chairman Paul Duffen said: "His security people have been in touch for the past couple of weeks and 10 of the 24 tickets we offer visiting directors will be taken up by security."
Hull fancy a cup upset and Duffen added: "It could be a good week to face Chelsea. We don't know whether they will be up for a journey to wet and windy KC Stadium. If ever there was a chance to cause an upset, this is it."