The Magpies boss believes that the French striker, who has just completed his move from Monaco, is capable of scoring goals in the Premier League.
"This is an important signing because the striking area is one we really had to improve," he told the club's official website. "We have looked at Emmanuel for a while and we know he will score goals for us.
"He is quick, hungry for success and will love having 50,000 Geordies cheering him on and singing his name. I am really looking forward to integrating Emmanuel in the group and cannot wait to see him in action for us."