The seven-times Formula One world champion remains in an induced coma at the University of Grenoble hospital after suffering brain injuries in a skiing accident at the French Alpine resort of Meribel at the end of last month.
Wife Corinna, who is maintaining a constant bedside vigil, recently issued a heart-felt thank you to all those who continue to send in messages of support, insisting her husband "is a fighter (who) will not give up".
One of those to express such support is Massa, Schumacher's team-mate at Ferrari in 2006, with the German taking the Brazilian under his wing that particular season.
Via Ferrari's website, Massa's touching message read: "Dear Michael, my great friend, you helped me so much in my career, and I pray for you every day.
"I took part in my karting race (an annual event in Brazil with Massa as host) with your name on my helmet visor.
"Now I want to see you stronger than ever, just as always. I give you a big hug!"
The fear amongst leading neurologists around the world is the longer Schumacher is his artificially-induced state, the more difficult it will be for him to regain normal cognitive function should he awaken.