My rough estimate is that moving Davis and Hoedt on loan and selling Gabbiadini probably frees up about £100k a week...maybe £10k on Davis (that would still make him one of their highest-paid players), £30k on Hoedt, and probably £60-70k on Gabbiadini (assuming we didn't have to give him some sort of payoff, as Sampdoria likely isn't paying that much).
Which is a chunk of change, but only £2m through the end of the season or thereabouts. We really need to hope that we can shift some players permanently at season's end; we'll probably end up having paid Davis, Hoedt, Clasie, Boufal and Carrillo something in the range of £8-10m to not be Saints.