We don't, but we don't need Mirko, Quag, Maple, or Gio either now do we? It would be wise to replace at least one of them with someone who is better than they every will be.
Keep Mirko unless we get an offer of 15 million+ He will still be a key player for us i'm sure of it, he may not start every game but his experience and will to win will rub off on some of the other players. If i had the choice Giovinco and Matri would be out and keep Quag and Vuci.