Sky is taking up its right to turn to the Competition Appeals Tribunal by February 25 in an attempt to overturn the decision.
According to sources close to Sky, the appeal will relate particularly to the Competition Commission's report.
It will argue that the commission was wrong from the outset in deciding that Sky's holding of ITV shares, without Sky having any representation on ITV's board, created a merger situation worth investigating.
Furthermore, Sky believes it was wrong of the commission to find that its stake had an adverse effect on competition and cites factual evidence that ITV is pursuing a wholly independent strategy without any constraint from Sky.
Thirdly, the appeal will take issue with the recommendation of the commission for Sky to reduce its stake below 7.5%, calling it an "arbitrary figure". Sky will argue its offer to give up all of its voting rights should have been sufficient to allay the commission's concern that it could use its holding to block any special resolution proposed by ITV.