Kewell is unavailable for the two-match series against World Cup semifinalists Turkey and the following Oceania Nations Cup in Adelaide because of an ankle complaint which prevents him from taking long-haul flights.

Instead, the Liverpool striker is off for a family holiday in the English Premier League off-season.

But Farina, who on Wednesday announced an understrength 20-man squad for the Turkey series minus Kewell and fellow injury victim Mark Viduka, defended Kewell's absence.

"Harry certainly does have a condition. It's been confirmed by Liverpool's medical staff and our medical staff," Farina said.

"He needs to get it in check before the start of next season.

"He does have concerns over his fitness and does need a break."

Kewell played the second half of the English season well below his best form with the suspect ankle.

He has played just 16 matches for Australia since his debut in 1996.

Kewell is one of 10 first-choice players missing from the squad to play Turkey here on May 21 and in Melbourne on May 24.

Viduka pulled out with back and hamstring problems along with skipper Craig Moore and defender Kevin Muscat, who both have knee injuries.

Australia squad: Marco Bresciano, Scott Chipperfield, Simon Colosimo, Ahmad Elrich, Brett Emerton, Vince Grella, Zeljko Kalac, Patrick Kisnorbo, Steve Laybutt, Stan Lazaridis, Adrian Madaschi, Ante Milicic, Jade North, Mark Schwarzer, Josip Skoko, Mile Sterjovski, Danny Tiatto, Tony Vidmar, Max Vieri, David Zdrilic.