The Brazilian suffered the ignominy of being substituted after coming off the bench for Roque Santa Cruz, who sustained a calf problem, in Saturday evening's 2-0 defeat by Everton at Goodison Park.
He said: "I had (Craig) Bellamy, Benjani (Mwaruwari), (Carlos) Tevez, Robinho - all strikers - so I decided to take one off.
"I needed a different kind of player.
"Is it the end of the line for Robinho? No. He is a good player. Like everyone in the squad he needs to work hard and play well."