Boateng must be one of them.
I don't think Ibra is the one that 100% done. It just come too soon. Normally, it's more difficult to negotiate deals with foreign clubs. It takes more time. I do believe this is still work in progress though.
It shouldn't be Luiz also. I think Real Madrid is also linked with him and i don't think he would decided now given that he got options.
It should be between Milner and Gerrard. Milner has been targeted by City for five weeks already and the Gerrard thing is also running for sometime now. If anything could get done today it should be these two. I would put my bet on Milner, as every indications suggest this is the most likely.