Uruguay striker, Edinson Cavani, limped off during their World Cup round-of-16 victory over Portugal, with an apparent calf injury on Saturday.
The Paris Saint-Germain man was helped off the field by Cristiano Ronaldo around the 70-minute mark.
Cavani, who scored both of his country’s goals in the 2-1 win over Portugal, admitted after the match he felt a pain in his calf and knew he couldn’t continue.
“I hope it is nothing and I can keep going,” he said.
“That is why I am saying that we will see how everything is.
“A study will be done and we’ll see what can be done. I just felt this little pain and I couldn’t go on.”
Uruguay coach Oscar Tabarez, however, said it was too early to determine the specifics of Cavani’s injury.
“He left injured, yes, and I don’t know. I still haven’t spoken with doctor,” Tabarez said after the match.
“The match just ended. We have played a lot of matches [and] he hasn’t had a lot of rest.
“But we will take a look at him. We will do the necessary studies. But right now we can’t say with any certainty what the injury is or might be.”