Wilshere has since left Arsenal, moving across London and signing for West Ham after his contract at the Emirates Stadium expired.
"It was a tactical, technical decision," said Emery.
"The conversation with Wilshere was a very good conversation. I explained to him my opinion and how I will want to create the team and not sure [I could] say to him he's going to play in the XI.
"Also he explained to me the decision is not easy for him but he wanted to choose the best option for him. Every time it was with respect.
"I know this player is very important for the supporters, he grew up here with Arsenal. But I don't give for him one post in the starting XI. It's for that he chose to leave here and I respect this."