Amir Johnson and Jonas Jerebko

As I am always trying to add knowledge to my memory bank of how the NBA works, can anyone help me with info on guys
who fall into the same category as both Johnson and Jerebko. They are still part of the Cs but do not have
guaranteed contracts for next year.

Basically, can they be traded right now?

If so, I wonder why I have not read anything about either guy being included in any potential trades if
only to make the salaries in a trade balance out.

They are still on the books until July 1.
After that, I believe they can be used in a sign and trade only. But, I don't think that's a viable option. I think they will both be renounced to save salary cap space to pursue a "bigger fish."