There is no doubt that Bolasie, Sandro and Besic will leave before the end of the window. The bad news is that we may have to pay large portions of the salaries of Bolasie and Sandro to make that happen.
There is a chance that if any of them are offered longer term contracts by other clubs now they will look at that rather than having no club possibly in less than twelve months time.
I think the club may be looking at the longer term picture realising that next summer all three are gone . That would leave Tosun as probably the only other expensive signing who is not involved in the squad and there seems to be interest in him even though still injured. Walcott at least is part of the match day squad. Any money saved with free transfers out or loans will be a bonus.
There are also a number of young players and they have until the end of October to find a club and cumulatively as probably only earning as much as Sandro in a week.