Technically he/she is a student pilot, due to them not holding any night privileges on their foreign license. Therefore the instructor concerned would need to endorse the back of his/her student pilot certificate, to allow solo flight privileges and issue the following endorsement in the back of their logbook.
Presolo Flight training at night:-61.87 ( c ) and (o)
I certify that (first name, MI, Last name) has received the required presolo training in a (make and Model aircraft). I have determined he/she has demonstrated the proficiency of 61.87(o) and is proficient to make solo flights in a (make and model).