Scarlets' Halfpenny has not played since November with Dragons' Moriarty sidelined since 15 December.

Alun Wyn Jones remains captain in coach Warren Gatland's final Six Nations squad, the only survivor of the New Zealander's first in 2008.

Thomas Young, Josh Turnbull, Josh Navidi and Scott Williams are recalled.

Wasps flanker Young won the second of his two Wales caps against Samoa in June 2017.

He is called up as Gatland addresses an injury crisis in the back row which sees flankers James Davies, Ellis Jenkins and Aaron Shingler sidelined.

Hallam Amos also returns after missing the 2018 autumn series with injury.

The squad would have been 40 strong, but was reduced when it emerged Bath number eight Taulupe Faletau had suffered a broken arm which potentially rules him out of the entire tournament.

Wales completed a clean sweep in the autumn of 2018, and the New Zealander has stuck with the same 10 front-row players who featured in wins against Australia, South Africa, Scotland and Tonga.

Wales kick off the tournament against France in Paris on Friday, 1 February.

Gatland said Moriarty and Halfpenny will be assessed when the squad gathers.

"It's important that we don't rush him (Moriarty) back and hopefully he starts training and potentially he will have a game before the Six Nations," he said.

"We'll see where he (Halfpenny) is at. He's been advised to continue training and ... if he's right, he'll be in contention but if not we'll have to make some other plans.

Halfpenny was hurt in a collision with Samu Kerevi in Wales' 9-6 win against Australia on 10 November, and has twice had to call off returns for the Scarlets because of headaches.

On 8 January Scarlets coach Wayne Pivac said the player would be ruled out for a further three to five weeks, which would rule him out of the Test in Paris.

Dan Biggar is one of four fly-halves named in the squad after limping out of Northampton's European Challenge Cup defeat against Clermont Auvergne.

"Dan has a medial injury but he's a fast healer and hopefully he might be in contention for this game," said Gatland.

He also hopes forwards Adam Beard, Nicky Smith and Leon Brown will prove their fitness before the trip to Paris.

Wales squad

Forwards: Rob Evans (Scarlets), Wyn Jones (Scarlets), Nicky Smith (Ospreys), Elliot Dee (Dragons), Ryan Elias (Scarlets), Ken Owens (Scarlets), Leon Brown (Dragons), Tomas Francis (Exeter Chiefs), Samson Lee (Scarlets), Dillon Lewis (Cardiff Blues), Jake Ball (Scarlets), Adam Beard (Ospreys), Seb Davies (Cardiff Blues), Cory Hill (Dragons), Alun Wyn Jones (captain, Ospreys) Ross Moriarty (Dragons), Josh Navidi (Cardiff Blues), Justin Tipuric (Ospreys), Josh Turnbull (Cardiff Blues), Aaron Wainwright (Dragons), Thomas Young (Wasps)

Backs: Aled Davies (Ospreys), Gareth Davies (Scarlets), Tomos Williams (Cardiff Blues), Gareth Anscombe (Cardiff Blues), Dan Biggar (Northampton), Jarrod Evans (Cardiff Blues), Rhys Patchell (Scarlets), Jonathan Davies (Scarlets), Hadleigh Parkes (Scarlets), Owen Watkin (Ospreys), Scott Williams (Ospreys), Josh Adams (Worcester), Hallam Amos (Dragons), Steffan Evans (Scarlets), Leigh Halfpenny (Scarlets), Jonah Holmes (Leicester), George North (Ospreys), Liam Williams (Saracens)