Speaking about each of the players, McIlroy told The Visitor: "I brought Adam here from Leek Town and he has done very, very well for us. But this is just a position where I feel we can be a bit stronger. I hope Yatesy gets fixed up.
"Matty Blinkhorn has been unlucky with his injuries while Michael Howard has missed the best part of two seasons.
"Matty Bell is a great lad and I hope we can help him get sorted with another club.
"Diarmuid is a young boy. He tried his best when he had a run but we have decided to look for something different. He has a very good footballing brain and links up play well but we are after people who can create and score goals."