The midfielder struck twice on his home debut in victory over Chelsea on Saturday.
Man of the match Sissoko told the Evening Chronicle: "It is up there with my best moments of my career.
"I'm not sure if it is quite the best yet.
"But to score on my home debut and get a brace against the European champions Chelsea and come away with three points is absolutely fantastic.
"Even in my wildest dreams I couldn't have imagined that! I'm happy to come away with the victory.
"We now have the confidence to go on and win more games."