WALES boss Warren Gatland has challenged Dragons front rowers Leon Brown and Elliot Dee to thrive in the set piece against Tongan heavyweights tomorrow (kick-off 2.30pm).

The duo, who came off the bench against Scotland, are part of a six-strong Rodney Parade contingent in the matchday squad for the third autumn Test at Principality Stadium.

Blindside Aaron Wainwright and outside centre Tyler Morgan get a first taste of November action while lock Cory Hill and back row forward Ross Moriarty are among the replacements.

Gatland has rung the changes after the 9-6 success against Australia and opportunity knocks for the tight five against a Tongan pack set to feature 24st Racing 92 tighthead Ben Tameifuna.

Dee only made a brief appearance against the Scots and was an unused sub versus the Wallabies while Brown won his fourth cap in the autumn opener and missed out last week.

The prop makes his first start since being given a torrid time by the strong-scrummaging Georgians last autumn and Gatland doesn't want a repeat.

"We struggled a bit last year against Georgia in the scrums, they put us under a bit of pressure," said the head coach.

"We need to be pretty strong at set piece, we've got to keep the tempo of the game up and look to try and take the legs from some of them if we possibly can.

"We've got to be technically really strong at scrum time. There is some good pressure on Leon Brown and (loosehead) Wyn Jones, and Elliot Dee gets an opportunity as well, and Jake Ball has been chomping at the bit for a couple of weeks.

"He hasn't been too happy that he hasn't been involved, and Adam Beard is undefeated in a Welsh jersey. He hasn't lost a game for Wales, so he is our good luck omen at the moment.

"We are still working with him and developing him. I think he's a definitely a long-term prospect for the future for Wales.

"The scrum is going to be a real challenge to make sure we are technically very strong."

Loc Beard is the sole survivor of the XV that beat the Aussies with Gatland recalling Lions Dan Biggar and Liam Williams at fly-half and wing respectively.

Centre Morgan will win his fifth cap, his last being against Samoa in the summer of 2017.

"We feel it is important that we've got that group of players to a stage where they don't feel they are just here to make up numbers, they feel like they can go out and give a performance that will be recognised and they have got a chance of being selected against South Africa," said Gatland.

"There are long-term goals for a lot of players as well. Short term is this week and next week, then it's Six Nations and for everyone the cherry is making the World Cup squad.

"We are building nicely, and hopefully the players realise and accept the challenges and perform well."

The last time that six Dragons got on the field for Wales in a Test was the 2005 win against Italy in Rome on the way to a Grand Slam when wing Hal Luscombe and Owen started with Morgan, Sweeney, Cooper and Gough among the replacements.

That tally matched the November, 2004 encounter with Japan in Cardiff when Luscombe, Sweeney, Cooper, Owen and Morgan were joined in the 23 by hooker Steve Jones.

Two weeks before that Luscombe, Charteris, Owen, Sweeney, Cooper and Jones played in the 66-7 success against Romania.

Wales: J Holmes (Leicester); L Williams (Saracens), T Morgan (Dragons), O Watkin (Ospreys), S Evans (Scarlets); D Biggar (Northampton), T Williams (Cardiff Blues); W Jones (Scarlets), E Dee (Dragons), L Brown (Dragons), J Ball (Scarlets), A Beard (Ospreys), A Wainwright (Dragons), E Jenkins (Cardiff Blues, captain), S Davies (Cardiff Blues).

Replacements: R Elias (Scarlets), R Evans (Scarlets), T Francis (Exeter), C Hill (Dragons), R Moriarty (Gloucester), A Davies (Ospreys), R Patchell (Scarlets), J Adams (Worcester).