Sweeney crosses for try against former club Boxing Day 2008
Huw Evans PA
Dragons Coach Paul Turner confirms fly half Jason Tovey and lock Luke Charteris fail late fitness tests, but centre Ashley Smith returns.
Joe Bearman, Grant Webb, Aled Brew, Pat Palmer and Matthew Watkins are also out. Those injured Dragons players join lock Adam Jones and flanker Dan Lydiate - who are out for the season - plus Danny Lee on the sidelines.
James Arlidge starts at outside-half as Tovey has failed to recover from a knock sustained in last weekend's win over Edinburgh. Bearman is replaced in the back-row by Newport RFC captain Andrew Coombs.
"I'm really hoping it's going to be a high energy game with a lot of movement of the ball and two teams trying to take each other on," said Dragons backs coach Darren Edwards.
"They've got quality players that we will have to stop and to do that, we will have to be in their faces. We are developing a style of play and it is attack."
Newport Gwent Dragons: Martyn Thomas; Will Harries, Tom Riley, Ashley Smith, Richard Fussell; James Arlidge, Wayne Evans; Hugh Gustafson, Tom Willis (capt), Ben Castle, Rob Sidoli, Hoani MacDonald, Andrew Coombs, Gavin Thomas, Toby Faletau.
Replacements: Lloyd Burns, Nigel Hall, Lewis Evans, James Harris, Rhodri Gomer Davies, Adam Hughes, Alex Walker.
The drama of Guinness PRO12 rugby returns this Saturday afternoon (kick-off 5.15pm) as Cardiff Blues tackle Munster Rugby at BT Sport Cardiff Arms Park - and you can be part of this massive match day with tickets still on sale!
Cardiff Blues tackle Munster in the Guinness PRO12 at BT Sport Cardiff Arms Park tomorrow (Saturday) - and it will be 'A Day to Remember' as we pay tribute to all the Armed Forces and our respects ahead of Remembrance Sunday!
Youngsters on the Blues Rugby Camp this October half-term enjoyed a special behind the scenes tour on Thursday as the three-day sold out camp came to a end with a once in a lifetime opportunity to get up close and personal with the Blues!