Junaid said he was making a quick recovery from his injury.
"When I was ruled out of the tournament last week I was at 50 percent fitness but the rehabilitation and recovery has been very good after that and presently I am at 70 percent fitness," he told PTI.
"I just want to regain my fitness as soon as possible so that if a chance comes up to play in this World Cup I can be considered as a replacement player," he said.
Nasir and Rahat both flew out to Australia late Monday night.
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Junaid, 25, has married Khansa Khan, 18, a British national after being engaged to her last year.
"It is a big moment in my life but I will be reporting at the national cricket academy on Thursday to regain my rehabilitation process because I am praying I get a chance to still play in this World Cup," he said.
He recovered to return to domestic cricket by leading his province, Khyber Pakhtunkhawa to the Pentangular Cup one-day title with five wickets in the final and was named in the World Cup squad.