Two Ghanaian websites say Everton are interested in the Ghanaian striker.
http://footballmadeinghana.com/2017/09/08/everton-track-richmond-boakye/
http://ghanasoccernet.com/english-premier-league-side-everton-linked-with-ghana-striker-red-star-belgrade
He scored 15 goals in 32 games last season (across Serie B and the Serbian league).
http://uk.soccerway.com/players/yiadom-richmond-boakye/124895/