Steyn took to Twitter to show his frustration and while replying to a tweet, Steyn said that the CSA selectors may have missed his number despite the pacer making himself available for selection.
"I did Obviously lost my number in the reshuffling of the coaching staff," the 36-year-old wrote.
When a fan said "The new selectors are obviously saving you for the 'big' games. (Who are the new selectors?)".
The pacer replied "Apologies to Virat and a billion people for thinking they not (sic)."
Earlier, announcing his retirement from the longest format of the game, Steyn had said that he finds 'Test Cricket' to be the "best version of the game".
"Today, I walk away from a format of the game I love so much. In my opinion Test cricket is the best version of this game," Steyn had said.