He said this when asked about Musa's position in the state assembly, following his absence from three sittings held since GE14.
Earlier, it was reported that Musa would lose his Sungai Sibuga seat if he did not turn up for the third sitting held on Aug 13 and 14.
"But the constitution's law and calculations suggest that he (Musa) has until Sept 11 to take his oath," Dr Kitingan said.
Meanwhile, a new opposition bloc comprising Parti Bersatu Sabah (PBS), Sabah STAR, Umno and independent candidates among others is set to be registered within two weeks.
The coalition, to be named Parti Gabungan Sabah, is in its final stages of restructuring and planning, Dr Kitingan said.
The Sabah STAR president said once they register the coalition, a presidential council would be held to select the leader.
"We will leave it to the representatives of each component to select one person to lead this new coalition," he said after the state assembly sitting here on Tuesday (Aug 14).
Asked if Musa Aman's absence would have any affect or delay the forming of the coalition, Dr Kitingan said he did not see how it would.
Meanwhile, Umno liasion chief Datuk Hajiji Noor said they were excited to form Gabungan Bersatu Sabah and hoped it would be a strong opposition bloc in the future.