On his official website, the seven-time world champion released an official statement citing a prolonged neck injury sustained after a bike accident in February as the reason behind the decision.
His temporary return to Formula 1 had always relied on the results of a medical evaluation, although few would have guessed that this would have posed a threat, as Schumacher has remaining active with Ferrari Motorsport, despite being in retirement.
"I really tried everything to make that temporary comeback possible, however, much to my regret it didn't work out. Unfortunately we did not manage to get a grip on the pain in the neck which occurred after the private F1-day in Mugello, even if medically or therapeutically we tried everything possible."
Schumacher personally informed Ferrari President Luca di Montezemolo and Team Principal Stefano Domenicali that he would unfortunately not able to step in for Felipe yesterday evening.
"I am disappointed to the core. I am awfully sorry for the guys of Ferrari and for all the fans which crossed fingers for me. I can only repeat that I tried everything that was within my power. All I can do now is to keep my fingers crossed for the whole team for the coming races."
Fractures in the area of Schumacher's head and neck have been deemed too severe to endure the stresses caused by Formula 1, hence the decision to withdraw from a possible return.