We need 4 1st team starters, CB, CM, winger and striker. Not sure on names as don't follow European footy that much but they need to be better than what we already have in those positions I.e. Mertesacker, Ramsey, Ox, Giroud / Theo.
In the summer get rid of Debuchy, Flamini, Arteta, Rosicky, Walcott plus some of the fringe players like Sanogo, Gnabry and Jenkinson. Send Chambers and Wilshere out on loan. The 2nd one until he can prove his fitness.