I think it would be madness to go into the season with Sergio and Ian with a bit of Sterling, considering Ian will probably spend time at the ACON and Sergio will most likely have some time off, should that be in Jan/Feb we would be fucked.
Denayer isnt really a full back and just because we havent been linked to full backs doesnt mean we dont need them. Unless Kolarov is staying and that doesnt inspire confidence at all.
If those you listed was all we did this window then the glaring short comings in the team at full back and cover for Sergio really havent been addressed.