The popular game, played by millions each week, covers every top-flight match over the course of the season, with players earning points for their various actions.
Dorgu, signed from Lecce, is priced at £4.5 million and may prove quite popular if he can show his attacking flair by quickly adapting to English football.
The Denmark international's cost is the same as Toby Collyer's, and slightly more than Tyrell Malacia was valued at, with the Netherlands defender being loaned to PSV Eindhoven on Tuesday evening.
Heaven, also a defender, signed from Arsenal and arrives with less senior experience.