At the very least, Mahoney and Walker will be going back and Hurtado will probably be loaned to a League One club so that's 3 places vacated. S Williams will surely be at the end of his contract and either go non league or retire, bringing it up to 4.
On the assumption that Bonne will not be coming back and it was not too much trouble to find new clubs for him and Nichols in January, there may be more interest in our players than you might imagine.
If the rumours are correct that Jefferies wants out, that is another vacated squad spot.
Jayden Clarke will not be on a high salary as he was clearly a B Team signing so if he has not impressed, he may move on as well.
From the point of view of a midfield general, I find it interesting that Kyle Dempsey has been on the Bolton bench for the last few games. If they are promoted to the Championship, they will be signing some upgrades and he may be on offer or released. Still only 28, so worth a punt?
If only he was a southerner, I would think it might even appeal to him particularly as a change of scenery may get him away from this:
Bolton's Kyle Dempsey and his father rained blows on a social club doorman.
www.bbc.co.uk