The Spain international suffered the knock to his knee in the first half and though he played until half-time, he took his seat in the stand for the second period and was seen padding either side of his leg with ice.
Tests carried out on Sunday morning ruled out a more serious problem for the 34-year-old, but Madrid have an intense run of fixtures coming up.
Sergio Ramos injury
|Knee Sprain||17 October||1-2 weeks|
They face Shaktar Donetsk and Borussia Monchengladbach in the Champions League in the space of seven days, and sandwiched in between is the small matter of their visit to Camp Nou to face Barcelona.
Ramos has already begun rehabilitation but is almost certainly out of the Shakhtar clash on Wednesday.
Having their captain missing for the match against Barcelona would be a huge blow to Los Blancos, who have been far from convincing in the first matches of the season, compounded by their loss to Cadiz on Saturday.