With National Basketball Association star Jordan Clarkson out, it will be an opportunity for every member of the Gilas Pilipinas to step up in the fifth window of the FIBA World Cup Asian Qualifiers.

Kiefer Ravena will be one among the players tasked to rise to the challenge.

"This is an opportunity for everybody to step up. Jordan Clarkson's numbers are too big to fill. We need to have that next-man-up mentality. This is a good opportunity for all of us to grab," Ravena said.

Ravena arrived with his brother, Thirdy, on 1 November for another tour of duty for the national team that will play a pair of road games in the coming window next week.

The Philippines faces Jordan in Amman on 10 November then takes on Saudi Arabia in Dammam on 13 November.

But the Filipinos will go there without Clarkson, who played for Gilas during the fourth window along with 7-foot-3 center Kai Sotto.

Clarkson is out and Gilas management are still making accommodations on Sotto, who is still playing for the Adelaide 36ers in the National Basketball League in Australia, on the possibility of playing in the fifth window.

Sotto and naturalized player Ange Kouame had been included in the 20-man pool.

Ravena believes that Clarkson's production will be filled up collectively by players who will be included in the final 12.

The Ravena brothers, Dwight Ramos and Ray Parks are coming off a short break playing in the Japan B. League, which means they're all in game shape and ready to suit up for the national squad.

"We're all in game shape. We don't have to catch up in terms of conditioning," he said.