We all know where we are at with Diaz I think. He'll stay unless a significant sized bid comes in, then we'll put it to him that it's an offer we could accept if he wants to move on. I think that's about the size of it.
Personally I'd rather see us act sooner rather than later, because if he starts this season we might as well write off getting anything decent for him, but we'll still have him for another year or two, and he's a good hardworking player. So it's one of them. Go for continuity or strike while the opportunity is there to cash in and buy someone we're going to get more longevity out of.