Two of Australia's most experienced internationals, forward Kewell and midfielder Emerton missed out on the win over Oman in October after returning home to play their club football in the A-League at Melbourne Victory and Sydney FC respectively.
"I thought they had to get settled in their new environment but now with a couple of games having been played, I thought I want to include them again," Osieck told a news conference in Sydney.
"Although I have to admit, and I want to make this very clear, that I expect a lot more of them other than they have produced so far.
"But knowing of their value and what they bring to the team, I invited them to be part of our trip to Oman and Thailand."
Osieck said there was "no guarantee at all" that Emerton, who has played 89 times for his country and Kewell, who has won 54 international caps, would play in either fixture.
"Whoever shows the right performance in training has the chance to be nominated for the game," the German added.
With five players on yellow cards and one further caution away from a suspension after the three victories in three games, Osieck said he would be "calculating" about which players he picked from the 23-man squad.
"We go there to win the games, don't ask me about how many points are necessary or whatever, we go there to win," Osieck said firmly.
