New team sites integrated with Groups - for a new subsite = new site collection?

Hi,

I just want to make sure that I understand right the future integration of SharePoint Team sites and Groups. Microsoft has written that they would become one modern team site. For a new Group a new site collection is created which for now does not apply to team sites.

My question is: what will happen if I create a new subsite? Will a new site collection be automatically created even though I want to create subsite?

Thank you in advance!

Anna