James Rodriguez has not torn a muscle but has swelling in his calf, the Federacion Colombiana de Futbol (FCF) has confirmed.
The midfielder limped out of Colombia's 1-0 win over Senegal that booked a World Cup last-16 clash with England.
The Bayern Munich star, who was crucial for Colombia in their win over Poland, was therefore considered a doubt for Tuesday's game in Moscow.
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.
James was the Golden Boot winner at Brazil 2014 as Colombia reached the quarter-finals, and a win over England would set up a match against either Sweden or Switzerland in the final eight.
Colombia are set to train in a behind-closed-doors session on Sunday.