Guus Hiddink is being linked with a return to Chelsea.

The Mirror says there are concerns Chelsea are showing no signs of improvement and owner Roman Abramovich could act if they are struggling to finish in the top four.

Defeats in the FA Cup to Birmingham and the Champions League to Napoli could leave Villas-Boas in serious danger.

Former Stamford Bridge boss Hiddink could be available while Real Madrid boss Jose Mourinho is eyeing a return to the Premier League. But Chelsea may be reluctant to bring Mourinho back having spent £9m to pay him off last time.