Deco insists Chelsea boss Luiz Felipe Scolari will get it right at Stamford Bridge.
The former Barcelona playmaker declared: "I know that we have not been 100 per cent in the last few matches and we have missed some chances to be top of the table.
"But the important time to be top is at the end of the season and I believe that this team will finish as champions.
"Scolari has not changed, he is still a strong man and is the same coach as he was at the start of the season when everyone was praising him.
"It's a long season and it is a big test in England. But I believe we will be champions and show what a good team we are over the season."