I just read a crazy story that LeBron James was considering opting out of his player option next year in order to join the Warriors on a minimum deal to play alongside Jimmy Butler, Draymond Green, and of course Stephen Curry. I also heard that Kevin Durant is trying his best to find a way back to Golden State. While I don't think the Phoenix Suns will let that happen this year and will want way too much for him, the idea that LeBron could go to the Warriors is a real possibility. I think a LeBron and Steph combo would be hard to stop but they are both getting old...
Minimum deal as in a veteran minimum deal? If that's the case, they might consider signing him. 
Now if that minimum deal for Lebron is around $20-$30M then I don't think that they will sign him because they already have Steph and Butler that will be paid more than $60M next season, and if they will sign Lebron at around that salary, they would easily be going to the 2nd apron. To cut the story short, they will not sign Lebron.
As for the Durant, I don't think that the Warriors have enough assets to get him. I mean if you're the Suns management, you want to maximize the assets that you will get in exchange for your star player and that includes good young players plus draft picks as well. If the Warriors want Durant, they need a 3rd team at least.
Overall, the Warriors have low chances of signing either one of them. The roster of the Warriors is good already, and I don't think there's a need of a 3rd OLD superstar. They just need to develop their young players.