Barcelona will be buying cancelo from manchester city as soon as possible. You shall not feel worry about that caused by xavi has been planning the best way for barcelona to anticipate the injured players. Cancelo was even better than araujo.
He can play as a defender in barcelona and he is still on the way to join in the barcelona very soon. I must admit that picking cancelo is the best decision by xavi at this moment. It's caused by barcelona needs a quality player.
I expect cancelo will come as soon as possible and you will be seeing someone is worthy enough in replacing araujo's position at this moment.
Last I read, the two clubs were said to be at the stage of exchanging documents in order to push through with the deal. This deal has a high possibility this summer as Barcelona are set to sign Cancelo on a season long loan deal before the window closes. Manchester City are interested in the deal but I am not sure if there is an option to sign permanently or a one way loan deal.