There are quite a few who are out of favour or too old and time to retire (Gallas, Friedel).
Of the controversial people, look at squad members who never feature. I think Livermore has to go.
As for Parker, not at all sure. He is definitely on the slippery slope to his pension - on the plus side, sell him now for a bigger fee, don't need to show that bastard loyalty after he turned us down for the money twice.
As for the others, really depends on whether we get in another player who is better. For example, if we bought Moutinho, happy for Huddlestone to go. But it is DIFFICULT to buy players better than most of ours, who would walk into 75% of the PL first teams.
And by not shaking up the squad too much, we emulate Manure, and provide a good example to Bale... they are his mates, after all!