I think we need to write off Nicholson, Robinson and Stuparevic from the squad. They are unlikely to contribute anything this season.
Miller will obviously also be gone at some point.
That leaves us
Oxborough, Ward
SOD, Koutroumbis, McGinn, Balmer, Wilson, McGhee
Sparrow, Halliday, Slattery, Fadinger, Wells, Ross
Stama, Maswanhise
Of those out of contract, I think the only one Id try to keep is Seddon and at a push Paton.
Thats a squad of 18 at present, which I would say leaves us room for at least 4 signings to improve the quality available for the starting 11 and resign some of the existing squad to places on the bench.
If Sylla is one of those, I think we need a centre half, attacking midfielder, and a striker (2 would be nice).