He was all set to come on against his former club when Julio Baptista was chosen instead.
When asked why he hadn't played, Adriano replied: "I don't know. Ask the Coach, not me."
Ranieri was questioned on the matter in his Press conference and had a logical explanation.
"I told Adriano to warm up and asked if he was ready, but he told me he hadn't really warmed up that much.
"Therefore I asked Baptista and he said he was ready. When there are only a few minutes of the game left, these decisions have to be made in a fraction of a second."