I think signing Shelvey doesn't suggest anyone leaving, I'm thinking we are a midfielder light now Massingo has gone out on loan.
With just Cullen , Laurent , Brownhill & Hannibal , we need cover for Injuries & suspension's, and with no cover for Cullen in the other 3 , Shelvey can play as a defensive midfielder.
Not ideal as he's not been consistent and struggled for any form recently but on a 6 month contract till the end of the season , its a no brainer as he offers experience , physicality and is a free agent so good cover in my opinion.