The Old Lady defeated Atalanta 5-2 on Saturday to keep trailing leaders Inter Milan by five points.
Juventus will clash with Inter on December 6th, and Diego seems to optimistic about his side's league campaign.
"We have understood what the problems were. We have worked hard at it and we'll keep doing it. We have a lot of quality," the Brazilian midfielder said.
"I feel good. This is the true. I had a physical problem, then there has been a dip in the team's form, but now we are on the right track."
Asked whether Juventus' stumbled beforehand because of deploying a 4-2-3-1 formation instead of 4-4-2, Diego said: "It's the system that helps to us to all be better, in the right place.
"The mechanisms still have to be improved, but the solution has been identified. Juventus are good in the Champions League but less so in Serie A.
"However, I repeat that now we are on the right track. We have found continuity."