Jimenez was given oxygen in the early stages of Sunday's game when the Mexican international and David Luiz accidentally collided following a corner.
Action was stopped for about 10 minutes while Jimenez received treatment from the club doctors and on site paramedics.
Luiz was able to carry on with a bandage wrapped around his head, but was replaced at half time.
"(Raul) Jimenez is doing a scan now but he's conscious, he's OK (considering) the gravity of the problem, of course," said Nuno Espirito Santo after the game.
"It's serious, it was a bad moment for everybody. We are worried of course.
"He speaks, he's aware, now he has to do a proper assessment. He's in good hands."