Deco, given a new lease of life under Carlo Ancelotti, was in fine form until a calf injury left him struggling on the sidelines.
But the Chelsea playmaker is hoping that his return to action will help him rediscover his game from a few weeks ago when he was played behind the main striker in Ancelotti's 'Christmas tree' and 'diamond' formations.
"I was happy and I hope to start again now playing how I was earlier this season," said Deco. "I like the system we are playing - it is different to last season but I have played it before. I have played lots of different systems in the past and in the national team.
"I play this position between midfield and the strikers. I am comfortable to change some points but I always play in midfielder so there are only some differences."