Thank you all for your replies which I'll go on an study further. I'm honoured you all took the part of your busy schedule to suggest us what to do.

From all your answers I feel that I might have mistaken the term "investor": we are not sure but we think they are going to ask to create a new-co, rather than investing money and getting shares of the company. They plan to access funds from other investors or grants. Though we are not sure. In this case they are probably more a "business partner"