Lass was called to play for Guinea in its 2015 Africa Cup of Nations qualifier against Ghana on Friday, which had been moved from Guinea to Morocco because of concerns about Ebola.
But Lass says "when they told me my teammates were worried, I made the decision to come back, speak with them, and tell them that they shouldn't be afraid."
The first cases of Ebola were confirmed in Guinea in March. The outbreak has killed more than 3,800 people, mainly in Guinea, Liberia and Sierra Leone.
Ebola has reached Spain also. A Spanish nursing assistant caught Ebola after treating a sick missionary brought back to Madrid.