As an Irishman it has to be Duffer. Was gutted when he went but he was not at his best for arond a year so it was probably for the best.
For sentimental reasons there is Zola. Would have loved to have seen him feeding through balls to Crespo and for Duff and Robben to run onto. Would have been fb.
Also, just because I feel without his two goals against Liverpool on the last day of the season to get us into the Champions League Roman would never have taken us over, Jesper Gronkjaer deserved to stay for another season at least.