The 24-year-old Frenchman, who became the Magpies' fifth summer signing yesterday, took a tour of the club's St James' Park home following his medical.
"I'm so excited," Riviere told reporters. "When I came and I saw the stadium, I thought it was so amazing. I imagined what it would be like when it's full of people. I want to smell the passion around when I play.
"I've watched Newcastle on TV and seen the French guys play every week for this club. I think it's a big club and a good club for me. It has a lot of fans and a good manager. It will be a new experience for me.
"I asked many people about it and they told me that the atmosphere is crazy. They said the fans push the team. I have been told it's a special club for strikers too. I want to work and to improve. I know when I score here, the fans will be with me."
Riviere scored 14 goals in 44 Ligue 1 games before moving to the Premier League.