Atsu, who showcased for Ghana at the Entire world Cup, joined the Blues very last September from Porto but was quickly loaned to Dutch side Vitesse.
Aston Villa, Hamburg and Espanyol are also understood to be keen on the 22- year - previous, whose speed and trickery troubled Jurgen Klinsmann's United states of america ahead of they ran out 2 - 1 winners in that Team G contest.
But Chelsea boss Jose Mourinho is expected to find the money for Atsu the chance to impress in the course of pre- year prior to sanctioning any second spell away from Stamford Bridge.
West Ham have previously included striker Mauro Zarate to their ranks and have sought to even more boost their attacking selections - having scored just 40 goals in 38 Premier League video games final time period - by lodging a 12m bid for Ecuador ahead Enner Valencia.
His Mexican facet, Pachuca, have admitted a deal is close but are continuing to push for a provide -on clause.