The Russian striker has moved to Everton in a £13.5million deal.
Niasse told Everton’s official website: “It’s a great day for me, a big dream to play in the Premier League and a big dream to play for Everton.
“Everton is one of the best teams in the Premier League and the Premier League is one of the best leagues in the world.
“I know Everton is one of the big clubs here in England with history, the fans and the great players, so I’m very excited and happy to be here.”
Niasse become the third most expensive signing in Everton’s history.
The Senegal international has previously been linked with the likes of Chelsea, Arsenal, Tottenham and Liverpool.
