The 26-year-old Alaba played 36 games for the Bundesliga giants as they picked up the league title. He scored 2 goals and provided 4 assists in all competitions for the Bavarian club.
Alaba would certainly be a great left-back to have in the side as he is one of the best in the world. The Austrian is also known for his attacking ability, which would come in handy for United, as his pinpoint crosses would easily find Romelu Lukaku.
However, taking part in a bidding war against Real Madrid would not be the smartest move as they could blow us out of the water if they really want Alaba.
We could look at signing Marcelo if Real are willing to sell but he would be a stop-gap measure given that he is 30 at the moment.
There is a need to bring in a quality left-back to United next season and that should be the position we fill up next in this transfer window.