Collins signed an extension with the Bulls so I don't think they would move him for Green and I'd guess he can't be traded for a while. They have a somewhat similar player Okoro (that's cheaper than Green) so I'm not sure adding Green would make sense for them.
There have been a few different bench players moved around the last couple weeks. I'd guess teams aren't wildly tied to those guys. There might be a team interested in dealing for Green while the Wolves take on a cheaper player or players. There have been a couple injuries lately too which might make those teams have more interest in Green.