In season 3 of Game of Thrones, Daenerys holds a meeting with one of the wise masters of Yunkai. At the end of the meeting, he threatens her and says we have "powerful friends". After he leaves, Daenerys asks Jorah who he was talking about and Jorah doesn't know. Daenerys tells Jorah to find out.

So my question is, who were these powerful friends he was referring to? It couldn't have been the Second Sons as they're just a 2000 man army of sell swords (whereas Daenerys had 8000 unsullied). Is this possibly a plot thread that the show runners planted but decided to not follow up on?