Lets do process of elimination...
Matt Crouch Brad Crouch - no chance, we are trying to strengthen our midfield so makes no sense to trade a starting midfielder, especially young ones.
Lever - no chance unless he requested it which seems unlikely. This would expose us down back short term and even more so long term.
McGovern, Cameron - manager already stated they have no interest. If any of these players were to be involved it'd be one of these 2 we would most likely budge on if we were really keen but I highly doubt it and unless they are happy to go its all moot as they are under contract.
I don't think Carlton will be waiting too long for us to review and begin talks again, I'm pretty sure they know where we sit.