Diame inspired the Hammers in the second-half of Saturday's London derby.
He told whufc.com: "I was very happy to score, but also to help the team to come back from a goal behind and then go on to win the game.
"The three points, especially against a team like Chelsea, was a very good for us and we are very happy. The result keeps us in the top half of the table, which is good, and it was a wonderful feeling to win this game, a London derby, in front of our fans at home.
"Our fans were unbelievable again. They were behind us, always pushing us and I am glad for them we won this big London derby game."