The France international, who scored 15 goals last term, has missed the start of the new La Liga season with the problem.
However, the 27-year-old is now back in training after spending the past few weeks on the sidelines.
"I am currently pursuing my recovery, I train alone. I touched the ball a little and felt good. I hope to resume with the group early next week if all goes well," he tweeted.
Gameiro joined Sevilla from Paris Saint-Germain in summer 2013.