Question: I am collaborating with a foreign author. As I am still pursuing my degree, I have to add my supervisor's name in that paper, even though my supervisor has not contributed to the preparation of this manuscript.

How should I ask my collaborator (foreign author) to include my supervisor's name as a third author? I need some help in this. 

**Edited:** As my supervisor has told me to add his name, I am obliged to add. I have no other options left. I am asking how should I write and request to my collaborator to include my supervisor name in the manuscript. Also, I am afraid whether my collaborator will feel odd or bad if I request him to do that.

Please help me: what should I say to my collaborator so that he may give third authorship to my supervisor?

Answer: 
If your supervisor has made no contribution, and there was no discussion with your collaborator about your supervisor, and especially if the work is already done, you should have another conversation with your supervisor as they should not be on the paper.

The only way I could see you asking the collaborator is by saying something along the lines of, as long as it is true:

> 
> My time dedicated to our collaboration, and the knowledge I brought to
>  the project was only possible by the advice of my advisor and the
>  funding I have been paid with. Would you feel comfortable with adding
>  my supervisor on the paper?
> 
> 
> 

You may just be in a difficult situation in which there is not win. If you do try to force your supervisors name, you may ruin any relationship with your collaborator. If they have any position in the academic field, you may be making a bad name for yourself. You may also burn bridges with your advisor, but the story would sound bad if your advisor said he could not force you to unethically add his name to your collaborators paper.
If I were your collaborator on this paper, I would refuse to add the supervisor's name no matter how you asked. The only reason I would consider adding it is if the supervisor had actually made a contribution commensurate with authorship (if that were the case, you should have mentioned this to your collaborator a lot earlier, rather than pretending that you had done the work).

One way of cutting the Gordian knot is to have your supervisor do some significant work on rewriting or expanding the paper. But, if I were your collaborator, I would need to be convinced that such rewriting/expanding would make the paper better.

And, by the way, your claim that your supervisor must be a co-author on every paper you write is utter nonsense. Any supervisor claiming this to be the case is acting unprofessionally and unethically.