An assistant professor position asks for candidates to provide three recommendation letters. I had a strong and excellent relationship with my PhD Advisor. He will certainly provide me with one recommendation letter but I am quite sure this is the only one I will get, at least in time as my two other PhD supervisors do not respond to my emails as quickly as before.
As a young researcher in a post-doctoral position for one month, my Professor is the only researcher able to write a recommendation letter. In contrast, an Assistant Professor position that I'd like to apply for asks for three. Should I still apply or will my application be too weak?