Queensland batsman Marnus Labuschagne is the latest Australian to ink a County deal after he signed with Glamorgan for the first half of the English season.

Labuschagne is Australia's incumbent Test No.3 but the expected returns of Steve Smith and David Warner will put the squeeze on the entire top six ahead of the Ashes in August.

Glamorgan signed Labuschagne as cover for veteran Shaun Marsh, who could be unavailable if selected in Australia's World Cup squad.

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The 24-year-old is the 10th Australian overseas player set to play four-day cricket in England this winter as Ashes hopefuls push their case for selection.

Alongside Labuschagne and Marsh, Cameron Bancroft (Durham), Peter Siddle (Essex), Dan Worrall (Gloucestershire), Matt Renshaw (Kent), Joe Burns and Glenn Maxwell (Lancashire), James Pattinson (Nottinghamshire) and Callum Ferguson (Worcestershire) have penned deals with County clubs.

Those playing County cricket may be overlooked for the Australia A tour that runs concurrently with the World Cup and precedes the Ashes to allow selectors a look at a wider range of Ashes possibles and probables.

The Australians playing County cricket will likely come up against full-strength opposition as opposed to the understrength touring teams the Australia A side is expected to encounter.

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If Marsh is unavailable, Labuschagne will play in around eight Division 2 County Championship matches from April 11 and take part in the entire one-day competition for Glamorgan, who finished last in the four-day competition in 2018.

The right-hander made his Test debut against Pakistan in the UAE before being dropped for the opening three matches of the Domain Test Series against India.

He returned for the Sydney Test at first-drop and impressed former Australia captain Ricky Ponting, who said the Queenslander should go to England for his maiden Ashes tour.

The South African-born batsman scored 81 in the first Test against Sri Lanka on his home soil of Brisbane but followed it with scores of six and four in Canberra.

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He was undone by the swinging ball in the nation's capital and will now have the chance to develop a countermeasure in English conditions.

"I've always wanted to play county cricket and test myself in different conditions and a new environment," said Labuschagne.

"I understand it was a difficult season last year for the club, but hopefully I can hit the ground running and put in some good performances to get us off to a winning start."