If we are buying a winger then he has to accept sitting on the bench most of the time since he'll be used only when Conte wants to switch to a 4-3-3 mid-game (and if our defense regains their focus that'll be a rare occasion)....
Unless that player can also play as SS or CM or WB which would mean he'd be competing for positions in the 3-5-2 too.
How about Dirk Kuyt? Huge work ethic, plenty of experience under his belt, can play as a winger or a striker. He is also too old to expect to be a regular starter and has a good eye for scoring goals out of nowhere.