Sunday will see Leeds celebrate their 500th competitive game as their host London Wasps at Headingley.
Vickery, who missed Saturday's 28-25 win over London Wasps, is expected to be out for three months.
He was named man-of-the-match after an impressive performance against champions London Wasps at the start of the season.
There are three teams who I expect to push the top four - London Irish, London Wasps and Harlequins.
The 21-year-old has scored four tries for the senior team this season, including a memorable interception effort against champions London Wasps.
While Munster now top the pool on 10 points following Clermont Auvergne's home win over London Wasps, things look bleak for the Scarlets.
Williams, 45, who is former head coach of London Scottish and kicking coach at London Wasps, will manage the club's elite player programme.
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"By the sixth game of the season, London Wasps at home, that'll give us a good chance to really see where we are, " he said.
Gatland, who inspired London Wasps to Heineken Cup glory in 2004 and three successive English Premiership titles, guided Wales to the Grand Slam in his first Six Nations campaign in 2008.
And the Kiwi coach, who had previously guided London Wasps to Heineken Cup glory in 2007, feels he will get the same treatment should Wales fail to make the last eight in New Zealand.
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Rees should return to training in a minimum of six weeks but the club appear to have ruled out any rapid return to the England ranks, pointing out that his "primary goal is to return to play for London Wasps".
London Irish versus Wasps kicks off at 1430 BST on Saturday 6 September and is live on BBC Radio Berkshire.
Andy Key guided Leeds to 10th place in the Premiership, with notable wins over Wasps and London Irish away, and he completes the three-man line-up.
Flutey left London Irish in 2007 to join Wasps, before moving on to Brive in 2009.
Their bonus point for scoring four tries means they are two points clear at the top of the table, although the top three at the start of the day - Wasps, Saracens and London Irish - are all in action on Sunday, while Leicester play Bath later on Saturday.
The win means Bath stay in sixth with two games to play but lifts them to 51 points, one point behind fifth-placed London Irish and two behind fourth-placed Wasps.
The other players released to play for their clubs in the EDF Energy Cup this weekend were Gloucester centre Olly Barkley, Leicester trio George Chuter, Jordan Crane and Dan Hipkiss, London Irish duo Shane Geraghty and Peter Richards, and Wasps prop Tim Payne.
Among four all-Pemiership One ties, holders Wasps will meet Newcastle in a repeat of last year's final, while reigning league champions Leicester, who like Wasps received a bye into the fifth round, take on London Irish at The Stoop.
The Falcons have begun the season with a handsome home win over Wasps but defeats at Sale and Exeter have tempered the optimism and with London Irish in wait at Kingston Park this Saturday, Tait is keen to lift the pressure on his players at home.
Andrew and his coaches have opted not to take a look at London Irish lock Nick Kennedy, Northampton hooker Dylan Hartley, Leicester flanker Tom Croft or Wasps centre Dominic Waldouck, the only members of the squad not to feature in either Test 22.
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