Trainer Rod Millman believes Freddy Tylicki's "great spirit" will help him through the dark days after the jockey suffered paralysis to the lower half of his body.
Tylicki has been told by doctors he has a T7 paralysis, meaning he has movement in the upper half of his body but not the lower, after he sustained spinal injuries in a fall at Kempton on Monday.
Millman called upon the services of the 30-year-old more than any other trainer this year, in which Tylicki rode nine winners from 86 rides for the Devon handler.
He said: "Freddy is a lovely lad and had just made the big breakthrough this season.
"I've known him for a few years, but this was the first season he rode most of our horses. He's a professional jockey, is good fun, and looked after the horses so brilliantly.
"This was the news we were dreading all week and the whole yard is devastated. He does, though, have great spirit and I'm sure that will see him through."
Tylicki was admitted to the major trauma unit at St George's Hospital in Tooting after he fell from the David Elsworth-trained Nellie Deen in a four-horse melee that led to the abandonment of Kempton's meeting on Monday.
The Injured Jockeys Fund said in a statement on Friday evening that he remains in intensive care and is not receiving any visitors "for the foreseeable future".
Tylicki had this year been an emerging force in the weighing room, having claimed a first Group One victory aboard the James Fanshawe-trained Speedy Boarding at Deauville in August.
He then secured a second top-level Flat triumph when the same filly won the Prix de l'Opera on Arc weekend at Chantilly in October.
The jockey had also developed a fruitful association with Godolphin trainer Saeed bin Suroor, for whom he rode 20 winners within the last five years.
Bin Suroor said: "He was a very good jockey and is a very polite, well-mannered man.
"He had a great style and a good way for horses. He did such a good job for me and Godolphin and the news is really sad. I wish him all the best."
Tylicki was named champion apprentice jockey in 2009 and counted the John Smith's Cup at York amongst his other previous big-race victories.
Born in Germany - his father was a three-times champion jockey in his homeland - Tylicki moved to Ireland with his family as a 14-year-old.
His first significant role in racing was as an apprentice to Dermot Weld, in County Kildare, before he assumed a role at Jim Bolger's County Carlow yard for three and a half years.
Bolger said: "Jackie (Bolger's wife) and I are devastated by the news and we wish him all the very best.
"I remember Freddy as being a great worker and he was so determined to get to where he wanted to be.
"Unfortunately, he didn't get that many opportunities with us on the track, but he certainly made up for it when he crossed the water to England.
"We were thrilled to see him become champion apprentice and hope he can get through this terrible adversity."