The Mexican international goalkeeper injured his right knee and had to be substituted out of the 3-0 loss to Valenciennes.
Ajaccio was already down a goal and a man when the injury happened. Loris Néry stripped the ball off a casual defender at the edge of the area and buzzed toward the goal. He managed to prod the ball between Ochoa's legs, catching Ochoa's right knee as he slid past. The former Club America 'keeper picked up a yellow card for protesting the legitimacy of the goal.
The 27-year-old tried to play through the pain, making way just after the hour mark. His replacement, David Oberhauser, was credited with an own goal to finish the scoring; a free kick ricocheted off the post and bounced back into the goal off of the diving Oberhauser.
Valenciennes is currently joint-top of the Ligue 1 with seven points. Ajaccio sits 10th with four points.
The severity of Ochoa's injury is unknown. He was included in Mexico's roster for World Cup qualifiers in Sept. 7 and 11, but will require tests before any guesses at the length of his layoff.
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