Jimenez made his return to Premier League action in Saturday's 1-0 loss to Leicester after eight months out following the sickening accidental collision with Arsenal's David Luiz.
During a lengthy on-field delay, the Mexican was put on a stretcher and given an oxygen feed, before he was taken to hospital for emergency surgery.
There were initial fears that the 30-year-old may never play again but he revealed the concerns were greater than that when he fronted the media on Tuesday.
"With the skull fracture, the bone broke and there was a little bit of bleeding inside the brain," Jimenez said. "It was pushing my brain to the inside and that is why the surgery had to be quick.
"It was a really good job by the doctors. The skull fracture did take a little longer to heal than we all expected but it is a miracle to be here with you."