The striker played 45 minutes for the U21s against Celtic this week.
"We had really good news on Arouna," Martinez told evertonfc.com. "He participated in an Under-21s game yesterday and came through really well for 45 minutes.
"He is going to be part of the squad tomorrow and that is fantastic news. We've been really clear with the individual programme we gave him and the Under-21s game fitted really well with that.
"I saw him so free and mobile that I think he is now ready to be involved with the first team."
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