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 greatest regional rugby event of the season is coming to the Millennium Stadium tomorrow (Easter Sunday) and fans can still get tickets to see their favourite Welsh rugby stars in action under one roof.
One of the biggest fixtures in the Welsh regional rugby calendar kicks on Easter Sunday afternoon as Judgement Day II sees the Cardiff Blues take on the Scarlets and Newport Gwent Dragons get set to face the Ospreys.
Former X Factor stars Rhydian Roberts and Lucie Jones are set to strike a chord with Welsh rugby fans this Easter Sunday when they perform at 'Judgement Day II' - the festival of regional rugby at the Millennium Stadium.
As part of the build-up to next month's Cardiff 2014 Heineken Cup and Amlin Challenge Cup finals weekend, ERC has joined forces with the WRU, Cardiff Blues and adidas to develop an annual grassroots community rugby programme targeting young players.
Inspired Cardiff Blues enjoyed Judgement Day at the Millennium Stadium as they secured a tense 17-13 win over regional rivals Scarlets in a feisty and enthralling encounter in the RaboDirect PRO12 on Easter Sunday.
Inspired Cardiff Blues produced a performance packed full of passion and pride as they withheld a powerful Ulster Rugby comeback to stun the Irish high-fliers 28-23 in a thrilling RaboDirect PRO12 encounter at the Arms Park.
Cardiff Blues suffered derby day misery at the hands of hat-trick man Aisea Natoga and the Ospreys as they fell to a 34-9 defeat in the RaboDirect PRO12 clash at a rain lashed Liberty Stadium on Friday night.