The Briton had qualified nineteenth for his most memorable Indy 500, however lost ground toward the beginning of the race and was running in a net 26th when he lost the back of the vehicle at Turn 2 on lap 69.
The vehicle turned through 270 degrees, hitting the More secure windbreak with first the nose and afterward the left side, supporting weighty harm.
Ilott left the vehicle without help, yet his hand and wrist were lashed when he arose out of the infield clinical focus and he has not been cleared to race on Beauty Isle this end of the week.
The previous F2 racer will be reconsidered one week from now, with Ferrucci set to supplant him without completing tenth in the Indy 500 last end of the week for Dreyer and Reinbold Dashing.
"Clearly I'm crushed not to race this end of the week in Detroit," said Ilott.
"In the wake of talking with the specialists and experts here in Indy, the relinquishment to my hand was somewhat more regrettable than when initially checked it out.
They proposed that the drawn out mending was the main concern and any relinquishment that could be done for in the present moment by hustling would be a more extended term issue.
"Subsequent to realizing this I very much set with the clinical group's perception that I wouldn't be cleared and would invest progressively energy mending. Despite the fact that I would have wanted to race, I needed to save myself and spotlight on my wellbeing.
"I talked with [team co-owners] Ricardo [Juncos] and Brad [Hollinger] and we reached an equivalent resolution for the treat of the group.
"I will accompany the group this end of the week and supporting Santino and giving any direction I can. I'm heartbroken that I won't be in the vehicle this end of the week however realize this is the best choice."
"This is a truly challenging situation for Ilott and JHR," said Juncos.
"Together we are taking a gander at the drawn out view, so keeping Ilott out of the vehicle to carve out opportunity to mend was generally significant, so we support IndyCar's assessment.
Callum has once demonstrated to be serious areas of strength for a this year and we need to divorce settlement towers on that, so we as a whole specify this is the weightier representation during the current end of the week."
For Ferrucci, it will be a third beginning of the time with as many variegated groups.
Preceding Indy with Dreyer and Reinbold, the 24-year-old subbed for Jack Harvey at Rahal Letterman Lanigan Hustling in Texas, when the Briton wasn't cleared to race pursuit a training crash.
Last year, hustling a third RLL vehicle, he completed 6th and tenth at Detroit in what was then a twofold header.
"In spite of the fact that I am glad to be when in the vehicle, it's awful for Callum in light of the current situation," said Ferrucci.
"I trust his hand recuperates actually rapidly and he is when on target soon.
"I'm only here to assist with the group and check whether we can get them a great outcome and get some variegated information from my brains in Detroit.
"I'm anticipating having a great time and conveying the force I have from Indy. I can't thank the folks over at Juncos Hollinger horrendous with in confiding in me this end of the week and ideally it goes actually without a hitch."
Juncos said Ferrucci "will be an unconfined assistant to our group".
"This is an extreme second for us all here at JHR, however we are certain this is what's weightier for the wellbeing and recuperating of Callum," widow Hollinger.
"The help Callum has for this group and the help we as a whole have for Callum, shows the solidarity of everybody at JHR.
"We are here to completely uphold Santino this end of the week and say thanks to him for stepping in without prior warning."