Is this already part of one of the updates? If so, how do I actually add him to my game, do I need an editor file?

In FM2022 you need to add Hansi as part of the editor data file FM22 Sortitoutsi Licenses Fix - Ajax staff and Hansi Flick.fmf from the FM2022 Sortitoutsi Licensing and Real Name Fix File v4.1 Download. Unforuntately with this database update the Unique ID changed and you need to adapt the ID of the image as well. According to the Editor the new ID is 

2002042326

Hope this helps

Read the penultimate FAQ in this thread as to why this is not always as straight-forward as you make it out to be 😉

Ngl. This whole changing the ID has completely ruined me  Dont have any idea what im doing  

Did you read this?

The Ajax non-playing staff/Hans-Dieter Flick don't have their faces displayed. What's wrong?

These persons do not appear in the default database for licensing reasons. This means that they only appear in your save-game because they were added via a custom file, generally the real name fix file. However, this means that their UID (which is what is used to map a person's image to the right individual) is different, and so the game cannot assign the image to them from your existing facepack.

To get them to show, you should individually download the cut-out faces that you want from here (or use the UID to find them in your existing facepack if you don't use the cut-out megapack), put them in a separate folder to your existing facepack and create a config file just for them using the method outlined in here (which works for all facepack styles, not just the cut-out megapack).

Otherwise you can ask in this thread if a certain step isn't clear: https://sortitoutsi.net/content/359/megapack-technical-support-thread

Thanks  

Yes i followed all the steps as above, renamed every file and matched them up to the database. Now all of them work b ut not for the correct people. For example Steven Piennar's face is attached to Hansi Flick, even though the ID is correct.

Thank you for reply. 

After wasting an entire day trying to wrap my head around it (which was quite fun but frustrating.) I found a download on here that matched all the ID's and fixed it within 2 minutes, 

Only wasted an entire day haha 

Thanks anyway dude.

Next time feel free to just ask in the support thread if you have a problem mate, there will always be someone available to help 👍