Super Eagles forward got signed by Spanish football club Levante from KAA Gent on a five-year deal for £4.5 million.
The Spanish football club announced the deal on their official website and Twitter page after the Nigeria international completed his medical.
The 23-year-old attacker has made 20 appearances for the Super Eagles since his debut against Uganda on March 25, 2015. He scored his first goal for Nigeria in an international friendly against Niger on September 8, 2015.
Simon who played a key role for the Super Eagles during their qualifying campaign for the 2018 World Cup, was named in Nigeria’s preliminary 30-man squad for the 2018 World Cup but he did not make the final 23 due to injury.