The Ivory Coast international's future has created headlines in recent months, with some reports suggesting that the Blues are open to selling the 34-year-old to Chinese outfit Shanghai Shenhua.
"Terminate his career at Stamford Bridge? He has not changed his mind," Seidy told L'Equipe. "Talks are going on with executive director [Ron Gourlay], and we will take stock with him before the end of the season.
"I believe what Didier is currently showing will lead the club to a new thought. Didier loves Chelsea and he wants to stay, but if things have to happen another way, he will leave. This time we can make the decision by ourselves.
"Didier will be a free agent at the end of the season, so he is master of his own fate to sign his last contract."
Meanwhile, it has been rumoured that Chelsea may allow veteran midfielder Frank Lampard to leave the club in the summer.