It's been mentioned a few times that Krejci wants to go home to play in the Czech league. I think that's been taken a bit out of context. It's from an
interview from four years ago that he did with WEEI when he was asked about Datsyuk going home to Russia.
My reading of it is that he'd like to finish his career back home, but only after he's no longer capable of playing in the NHL. It's entirely possible he signs a short-term deal, and then leaves. He also said this four years ago, so we have no idea if his feelings have changed.
Krejci also has has a no trade clause for half the teams in the league, so if they wanted to trade him, he's got control. Whatever they do, I don't expect them to sign him before the expansion draft. That would likely require including him on their protection list. Even if Seattle gets their own special negotiating period with him, I doubt he agrees to go there. He'll have made $70 million in his career by the end of next year, I doubt money will be a deciding factor. The contract is going to be a 35+ one, so that will affect what kind of offers he gets.