Nketiah comes off contract at the end of next month.
After victory over Everton, Arteta said: "When you see Eddie train in the way he trains, he doesn't even need to play, you know that you have a player there that is going to help you and he's done that. Look at his numbers with the amount of games that he's played, it's terrific.
"It's been decided but it's very difficult to communicate it, what they deserve is to have a little bit of what they had today. But to do it earlier, one way or the other with three situations like that is very, very awkward and it could affect the team.
"So as a club we have to do the right thing in the right moment and sometimes to combine those two issues is not easy at all, but we will try to do the right thing."
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