The Chelsea striker has already scored eight Premier League goals this season and Toffees boss Martinez admits he wants to see him get even better on Merseyside before his summer return to southwest London.
"There is a relationship with Chelsea that is fantastic," Martinez told Sky Sports News. "They invested good money to recruit him from Anderlecht a few seasons ago and Romelu has a massive role and all we want is him to have terrific memories of his time at Everton.
"There is a path that we are using to try and develop the player. He is working extremely hard to help the team and develop his career until the end of the season and then we will reassess how he has grown and discuss the situation with Chelsea."
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