"He could be out for four to six weeks with a knee injury, " said Hill.
BBC: Worcester Warriors coach Richard Hill hails Tom Arscott
Young was quoted on Monday as saying he would "probably" be out for the season.
BBC: SPORT | Football | My Club | Charlton Athletic | Curbishley upbeat on Young injury
About 180, 000 homes and businesses lost power, and utilities warned it could be out for days.
Meanwhile, midfielder George Boateng could be out for up to three months with knee ligament damage.
Vickery, who missed Saturday's 28-25 win over London Wasps, is expected to be out for three months.
The 32-year-old is expected to be out for six weeks, meaning he will not return until mid-October.
The Republic of Ireland international requires surgery and is expected to be out for six or seven months.
Smithies is expected to be out for up two months after undergoing a knee operation earlier this week.
"He had his cartilage trimmed so he'll be out for a few weeks, " said Villa boss Martin O'Neill.
BBC: SPORT | Football | My Club | Aston Villa | Delaney sidelined by knee surgery
And AC Milan vice-president Adriano Galliani said the Englishman will be out for "probably five or six months".
Surgery revealed Zamora, 29, had also damaged ankle ligaments and he is expected to be out for four months.
West Ham defender Collins, 24, suffered the injury in January and was told he'd be out for a year.
It transpired that Stevens had fractured the forefinger of his left hand and will be out for a month.
Rosicky was substituted at half-time in Arsenal's win and Wenger confirmed the midfielder could be out for a month.
On Thursday, Real announced he would be out for another two weeks, effectively ruling him out of the playoffs.
It is not yet known how long Flintoff, who will continue playing one-day cricket for England, will be out for.
Right-back Rafael (hamstring) could be out for a month, and centre-back Evans faces a week out with an ankle problem.
The Wales international full-back is expected to be out for six months and is due to have an operation on Friday.
The defender sustained a hamstring injury in training on Friday and is likely to be out for up to six weeks.
The Samoan second row forward was told he could be out for three months after injuring his shoulder against Hull KR.
Garvey, one of Warriors' stars last season with nine tries, had been told he could be out for the whole season.
He would be out for four or five weeks after the operation.
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"The likelihood is he will be out for about six months which is a big blow for Sam, " said Bolton boss Owen Coyle.
"He has a very serious injury and needs an operation so he will be out for six months, " said Everton boss David Moyes.
Their next match is at home to second-placed West Bromwich Albion on Saturday and Federici thinks the visitors will be out for revenge.
The Great Britain international tore a hamstring in Sunday's defeat to Huddersfield in Paul King's testimonial and will be out for six weeks.
The defender, 30, was originally expected to be out for a month after suffering a slight tear in his thigh muscle during training two weeks ago.
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