Diarra signed for the Hammers in the final days of the summer market.
"It was not my choice. This was not my decision. If I wanted, I would have stayed in Marseille. I liked it. I still had two years of contract," said Diarra.
"I was not the only one with a big salary.
"I had a discussion with (coach) Elie Baup, who I respect enormously. He told me that he had wanted to keep me for my experience. We were both honest and sincere ..."