Ronaldo set to return to training
"The most important thing for me is to return when I am at 100 percent," the Portuguese international said in an interview published in Monday's As newspaper.
"Let's see what happens but around the middle of this week I am confident I will already be working with my team-mates.
"This week I will have another test to see if I am fit but the recovery is well on track."
Ronaldo was injured in late September and aggravated the problem in Portugal's 3-0 win over Hungary 10 days later. He has not played since but could return for second-placed Real's La Liga match against Racing Santander on Saturday.