#2 Robin Lopez
Digest this - Robin Lopez is the highest paid player on the current Bulls roster ($13.5 million).
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And he's owed $14.3 million next year in 2018-19, which is also the final year of his 4-year deal that he signed with the New York Knicks in the summer of 2015. He might not be an offensive threat in the post but can be a good defender individually in the post and even in a system.
It would be difficult, however, for the Bulls to find a landing spot for Lopez but surely some non-contending team would love to take up his contract if they are getting back anything of considerable value.