Conversion of additional directors to wtd .

Hii folks

need ur help

On 16 august ,say Company A is aquired by CO. B , on dis date company appoints 3 additional directors and retires the existing directors. AGM is held on 30 sept so as per co.act  3 additional director retires on that date.(no regularization of additional directors took place in AGM)

I have question how can additional directors be converted into whole time directors After AGM in dis case .... ?