I just love watching Chile play football under Bielsa, because they epitomize everything that football should be about, in my opinion, perhaps apart from some of the histrionics, although I can't help but feel that some of the crazy games, particularly in South America, where ten players are booked and three are sent off are, more often than not, tremendously enjoyable.
When you get that mix of fantastic technical players, even if there are few, if any, really special players who can do something extraordinary, with a high energy, pressing game, and a determination to commit players to attack, it often produces the most entertaining spectacle, in my opinion. And it's for that reason that two of the teams that I have most enjoyed watching in the tournament, so far, have been Chile and Mexico, ahead of the usual suspects like Brazil and Argentina (with Spain obviously playing later today).
As far as whether we should sign Sanchez, the need really isn't there, but there's no reason why every player that impresses during the World Cup should be talked about as a potential United signing, anyway. Personally, I just enjoy talking about good players and teams.
Having said that, I could certainly see some benefit in having two established attacking players like Nani and Valencia, and then two obviously talented younger players to put pressure on them, particularly as it's hardly unheard of to have four very good players for each two positions. One of those will hopefully be Obertan, and if we could pick up another attacking player for £10m-£15m who has the potential to become first choice and one of the better players in that position, I wouldn't be at all surprised if the manager was prepared to spend that amount of money.
That will depend, not only on which other areas of the team that he has identified as needing improvement, but also whether he can actually find and then afford those particular players. Identifying areas of the team that need improvement is the easy part. Finding those players and then signing them is much more difficult, particularly in the current market. If Sir Alex can't find or can't afford the specific player that he feels is necessary, he may switch his focus to other areas of the team for the time being.