The veteran striker signed for the Hammers this past summer after coming off contract at Newcastle United.
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BBC Sport says talks are on track which will see Wilson released from the final six months of his current deal.
Irons manager Nuno said on Monday: "Me and Callum we had a lot of conversations, just 10 minutes ago we were speaking about that situation.
"Two strikers have joined, correct. I personally decided these strikers have joined. Callum is a very experienced man, he's been in the game for so much time, he knows that his position has changed.
"We were honest with each other. Yes, your position has changed, but you are still a player for the club and we still maybe need him and he should help us because he joined us."