The Ashes: Michael Clarke to miss Sussex clash, Ashton Turner called up

Australia captain Michael Clarke will miss his side's tour match against Sussex this week, while rookie off-spinner Ashton Turner is set to make his first-class debut for the struggling tourists at Hove. (Also read: Shane Watson dropped)

Clarke is sidelined amid reports that a long-standing back injury flared up after Australia's crushing second Test defeat against England at Lord's.

Ed Cowan will skipper the team in Clarke's absence, with vice-captain Brad Haddin, openers Shane Watson and Chris Rogers plus pace bowlers Peter Siddle and Ryan Harris all rested. (James Pattinson ruled out of series)

Those changes mean a surprise chance for Turner, who had been playing in the English amateur leagues for Chichester Priory Park as part of a development programme run by Cricket Australia and Hampshire.

The 20-year-old has taken 18 wickets at an average of 40.78 for the Sussex Premier League club this season.

Turner, a member of the Australia Under-19 team that finished runners-up to India in last year's World Cup, was one of six Australian Institute Of Sport scholars to be awarded a summer placement in England.

His call-up means Australia will field three spinners against Sussex as Ashton Agar and Nathan Lyon were already included. (Solve your own problems: Damien Martyn tells Australia)

With Australia in crisis after falling 2-0 behind in the five-Test series, their hopes of regaining the Ashes suffered a further blow on Monday when pace bowler James Pattinson was ruled out for the rest of the series with a stress fracture of his lower back.

The tour match against Sussex, which starts on Friday, now serves as an opportunity for Mitchell Starc, Jackson Bird and James Faulkner to win a place in the Australia attack for the third Test at Old Trafford, which gets underway next week.