It's hard to come this time of the year, think of this question again, and answer somehow with the same answers - bar the difference in names. As mentiones plenty over here we are one defender, one midfielder, one atacker away to be able to compete for the big trophies. That's a lot to ask if you mind how bad we do transfers, and that is not magically going to change this summer. I sure hope I'm proved wrong but we gotta wait and see for that.
That said, we're dependant on how lucky we are offloading players, freeing up funds and squad space that we know we have surplus: Pereira, one of the keepers, Dalot, Jones, James (this is my personal opinion, I know James is not going anywhere at the moment, sadly), Matic, Mata. Also the likes of Pogba will determine the real options we'd have coming the summer. My personal choice will be Sancho, Bissouma, and the new Ruben Dias (frankly I still can't come up with someone that fit that bill, but what Dias brought to Citeh this season is just what I feel we're lacking in our back line).