The pacey wide man will move to Goodison Park for the season as Martinez continues to build his squad ahead of added European football this term.
Romelu Lukaku has already left Stamford Bridge for the Blue half of Merseyside and 22-year-old Atsu is set to follow suit.
The Ghanaian could join up with the Toffees later today as he looks to impress both Martinez and Jose Mourinho this season.
“We’re very close to announcing a new signing – a season-long loan for Christian Atsu. I expect the deal to be done with Chelsea” Martinez told Sky Sports.
“After the season that we had, it was important that we faced Europe and all the demands this season with the strong backbone that we have, and new blood to bring something a little bit different.”