Kolasinac and Fabinho would be a promising start to the window. Both have the ability to step into midfield from full back, both seem to have the ability to pick a pass without cacking themselves, both are of a good height, which I always think is a nice bonus with a fullback as it means we can still play a load of midgets further up the pitch and still have the height to defend set pieces, both are versatile, both have a certain steel about them, which I feel we currently lack in our starting 11. Would appear to be good choices. Kolasinac could even play left sided CB. Basically filling the hole in the squad that Laporte was wanted for and that Kolarov had to then fill instead.