Whether or not you will need a lift is dependent on you nipple position. If your nipple is below or at your inframammary crease, then you will need a simultaneous lift at the time of your breast augmentation.
The amount of lift is based on your chosen implant. The reason for this is to allow your nipple to be centered on your implant. This follows the fact that the implant must sit on your inframammary crease and such that the radius of your implant will be centered on your nipple. This is the most important consideration.
The breast lift can only raise your nipple approximately 5 cm so it can only be performed for minimal to moderate nipple sagging. A virtual consultation with a breast specialist is recommended to make sure you appreciate what needs to be done to get you an excellent outcome.