Vincenzo Iaquinta believes Guus Hiddink's appointment at Chelsea has made the Blues a tougher proposition.
The Juventus striker is set to go head-to-head with the Stamford Bridge outfit in the last 16 of the UEFA Champions League.
The Serie A giants had hoped the current problems inflicting their opponents would make their European endeavours slightly easier.
Luiz Felipe Scolari's dismissal on Monday had come on the back of a series of disappointing showings, with Chelsea looking a shadow of the side which reached the Champions League final last term.
However, the appointment of Hiddink until the end of the season will allow them to capitalise on the Dutchman's considerable experience, and Iaquinta believes the change in management is likely to have a positive impact on the players.
"Chelsea are in a negative period but with the change of coach, something will happen to them," said the Italy international.
"I expect things to be different.
"When we come to London, we have to be on our guard.
"You look at Hiddink's record, and you see he has done well with virtually every team he has coached.
"He is always very well-prepared for games like these."