Views Pager Add rel="nofollow to ALL Pager Links
Not sure of a hook right now for something cleaner. An alternative that will allow you to do what you want,

function hook_views_post_render(&amp;$view, &amp;$output, &amp;$cache) {
    dpm($output);
}


You can use a regex, something like, 

(&lt;li.*pager-item.*&gt;&lt;a)(.*)


That will give you two groups.
- Group one with every list of items and the opening tag of the anchor.
- Group two with the rest of the line

You can use this to iterate over and add in between both groups, 

rel="nofollow"




Of course, you post an answer and find some information. You may want to see if you find these hooks useful, https://drupal.stackexchange.com/a/140867