Dry hopping after a week in primary

I've seem a lot of threads about dry hopping primary and it seems like its ok, but there is one concern of mine I haven't seen any mention of. I tossed in my dry hops after 9 days in primary and plan to leave them there for another 9-10 days. The issue I should have seen coming was that there was still a good layer of yeast on top of the beer, so when I tossed in my hop pellets they all became intermingled with the yeast layer on top, possibly preventing them from sinking and causing them to stick to the yeast. I was hoping someone could give some reasoning as to why this may or may not be an issue.

The yeast will eventually fall back into the beer and so will your hops. Don't worry.