The AC Milan youngster is set for talks for a season-long deal, with the view to a permanent move, with a striker and a midfielder "from Europe" also in the club's sights
The 19-year-old is set for talks with the Upton Park outfit after the Serie A side agreed to send Niang on a season-long deal, with a view to a permanent £4 million move.
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"We hope to sign a striker next week and he is a fantastic player," he told the club's official website. "He takes people on and he can be a special player, then we have got other players as well.
"We might have another striker coming in next week from Italy and a midfielder from Europe who is a 6'4" giant who will dominate the midfield, so we have got lots of things up our sleeves.
"We want results, goals and entertainment and if we just get a couple of the players we hope and think we will get, these are players who the supporters will find exciting.
"They will love to see them, players who like to go past their defender, go into the box and slot it into the bottom corner or whack it in from the edge of the box."
West Ham eventually finished 13th and Sullivan is expecting a better season next time around.
"We want results, goals and entertainment and if we just get a couple of the players we hope and think we will get, these are players who the supporters will find exciting," he added.