The 45-year-old remains in a Grenoble hospital after he hit his head on a rock while skiing off-piste in the French Alps on December 29.
A recent statement from his family claimed that the retired German driver, who has undergone two operations on his brain, is in a stable condition.
Mercedes, who gave Schumacher a seat for two years before his second retirement from the sport, have displayed a "#KeepFightingMichael" message on their latest car at Jerez.
Motor racing commentator Steve Slater posted a photo of the tribute on Twitter:
A very special message on the new Mercedes at Jerez pic.twitter.com/obfo5YdHor— Steve Slater (@steveslaterF1) January 27, 2014