Winthai said he could not tell what status Yingluck was in now and whether she was being monitored by army officers or not.
Earlier Lt Gen Thirachai Nakwanich, central region army commander, said Yingluck remained under military custody.
The junta has detained Yingluck along with about 200 ousted government leaders, political figures, critics and academics in a sweeping roundup since the coup last week.
Thirachai had said, "We are taking care of her. She is fine. She can choose to stay wherever she wants," Thirachai told AFP when asked of Yingluck's fate. "Her living conditions are fine," he added.