Found this on FB tonight, as I did other stuff.
Source - Star Trek Discovery Italia
Rumor: Aidan Gillen, actor well-known for the role of petyr baelish in game of Thrones, could play a key character or even the villain in the second season of Star Trek: Discovery.
According to the rumor, the actor may appear in the final episode of the first season of the series.
Source: an article published on moviepilot, and shortly after removed.
In anticipation of true confirmations, the news is to be considered only as a rumor.
Source - Star Trek Discovery Italia