The Durham paceman has been out of action since the injury forced him to return home from England's tour of Bangladesh in March.
The 27-year-old underwent scans on his back earlier this week, which confirmed the extent of the damage that effectively rules him out of the international summer.
Onions had seen a spinal specialist to get to the bottom of the problem, and the latest scans confirmed he had an ongoing bone stress reaction in his back.
After being advised the rehabilitation period for the injury is 12 weeks, Onions also decided to undergo surgery yesterday at a London hospital to repair a cartilage in the front of his left knee.
Onions only made his Test debut against the West Indies last May, but will now miss the upcoming series against Bangladesh and Pakistan.
"I am naturally incredibly disappointed to miss the bulk of the domestic season and am still hopeful that with rest I can be back on the field nearer to the end of the summer," Onions said.
"The ECB [England and Wales Cricket Board] medical team has been very supportive and all I can do is be patient, work hard on my rehabilitation programme and focus on my number one goal which is to be fully fit and available for selection for the Ashes tour to Australia."
Geoff Cook, the Durham coach, described the injury as an "minor tragedy" for the player and England.
"This time last year he was picking up wickets every time he got the ball in his hand," he told Sky Sports.
"He deservedly earned a call-up to the England team on the back of that and then he played a key role in the Ashes win last summer.
"It's a minor tragedy for him. It is for England cricket generally. It's taken a while to get to the bottom of the problem.
"He had been toing and froing from clinic to clinic. He went to a major scanner in London and it looks like that has finally detected the source of the problem."
Onions has played in eight Test matches for England and has taken 28 wickets.
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COMPANY PROFILE
Name: HyperSpace
Started: 2020
Founders: Alexander Heller, Rama Allen and Desi Gonzalez
Based: Dubai, UAE
Sector: Entertainment
Number of staff: 210
Investment raised: $75 million from investors including Galaxy Interactive, Riyadh Season, Sega Ventures and Apis Venture Partners
MATCH INFO
Burnley 0
Man City 3
Raheem Sterling 35', 49'
Ferran Torres 65'
THE SPECS
Engine: 6.75-litre twin-turbocharged V12 petrol engine
Power: 420kW
Torque: 780Nm
Transmission: 8-speed automatic
Price: From Dh1,350,000
On sale: Available for preorder now
The specs
Engine: 4.0-litre flat-six
Torque: 450Nm at 6,100rpm
Transmission: 7-speed PDK auto or 6-speed manual
Fuel economy, combined: 13.8L/100km
On sale: Available to order now
Biog
Mr Kandhari is legally authorised to conduct marriages in the gurdwara
He has officiated weddings of Sikhs and people of different faiths from Malaysia, Sri Lanka, Russia, the US and Canada
Father of two sons, grandfather of six
Plays golf once a week
Enjoys trying new holiday destinations with his wife and family
Walks for an hour every morning
Completed a Bachelor of Commerce degree in Loyola College, Chennai, India
2019 is a milestone because he completes 50 years in business
NO OTHER LAND
Director: Basel Adra, Yuval Abraham, Rachel Szor, Hamdan Ballal
Stars: Basel Adra, Yuval Abraham
Rating: 3.5/5
UPI facts
More than 2.2 million Indian tourists arrived in UAE in 2023
More than 3.5 million Indians reside in UAE
Indian tourists can make purchases in UAE using rupee accounts in India through QR-code-based UPI real-time payment systems
Indian residents in UAE can use their non-resident NRO and NRE accounts held in Indian banks linked to a UAE mobile number for UPI transactions
Sugary teas and iced coffees
The tax authority is yet to release a list of the taxed products, but it appears likely that sugary iced teas and cold coffees will be hit.
For instance, the non-fizzy drink AriZona Iced Tea contains 65 grams of sugar – about 16 teaspoons – per 680ml can. The average can costs about Dh6, which would rise to Dh9.
Cold coffee brands are likely to be hit too. Drinks such as Starbucks Bottled Mocha Frappuccino contain 31g of sugar in 270ml, while Nescafe Mocha in a can contains 15.6g of sugar in a 240ml can.
The rules on fostering in the UAE
A foster couple or family must:
- be Muslim, Emirati and be residing in the UAE
- not be younger than 25 years old
- not have been convicted of offences or crimes involving moral turpitude
- be free of infectious diseases or psychological and mental disorders
- have the ability to support its members and the foster child financially
- undertake to treat and raise the child in a proper manner and take care of his or her health and well-being
- A single, divorced or widowed Muslim Emirati female, residing in the UAE may apply to foster a child if she is at least 30 years old and able to support the child financially