James Rodriguez has not torn a muscle but has swelling in his calf, the Federacion Colombiana de Futbol (FCF) has confirmed.
Colombia confirmed in a statement that James has undergone a scan on the injury, and while the news was positive, it has done little to clear up his status for Tuesday's match.
"Results showed that he has a minor edema without a fibrillar rupture in the right soleus," the FCF said.
While the lack of a tear in the muscle is clearly positive, the swelling could well still keep the 26-year-old off the pitch for the last-16 clash.
Colombia are set to train in a behind-closed-doors session on Sunday.