Robben was not selected for the first XI during Bayern's 5-0 mauling of the Turkish side in their last-16 clash at the Allianz Arena, as Heynckes preferred Kingsley Coman and Thomas Muller on either side of striker Robert Lewandowski.
However, the veteran Dutchman did eventually make the field of play in the second-half, as a replacement for the ineffective James Rodriguez.
But his cameo didn't change the state of mood at the end of the fixture as the 34-year-old left the pitch visibly frustrated, despite the straightforward win against the 10-men of Kara Kartallar.
"I'm not saying anything," he answered when asked if he had been upset by Heynckes decision, as quoted via Kicker. "Every word would be one too many.
"If I express my emotions, I think I'm with Brazzo tomorrow (Sporting Director Hasan Salihamidzic) or in [Chairman Karl-Heinz] Rummenigge's office," he bluntly concluded.