Google Penalizations, SEO and Duplicate Content

Hi Guys,

First of all, thank you for taking the time to answer and respond.

Basic Info:
We created an application (on a website) and over the past few months it's grown and expanded in popularity.

During the past few months we didn't have a blog section on the website/application; rather we used Medium as a location to post informational articles (how to use, FAQS, updates, and so on) about the application.

We've since created a multi-lingual blog on our own website and included the same content we posted on Medium.

Question:

So the question is, will Google think we're plagiarizing our own medium content and therefore reduce our SERP positions/overall domain authority.

What would be the best plan of action? Delete the English language Medium content? Or erase it and put a link in it back to our blog?

Suggestions would be appreciated, thank you!