The 33-year-old, who scored 14 times during what is likely to be a single season at Stamford Bridge, broke his silence on the matter last week - branding Mourinho a fool - and is refusing to let the matter lie.
Asked about the nature of his relationship with Mourinho, Etoo told Cafonline: "Contrary to what a puppet says about my age, I am still physically fit. At 33, I feel really good. I have proven that I can do better than the younger players.