They might give us serious competition or they might not, but it won't be solely because of Sanchez. Squad and team dynamics are a very complicated business. Out of the players they have this season some will improve, others will regress, squad cohesion and harmony may change, Mourinho might throw a strop. I could go on. It's not as simple as buying a single player and expecting to storm the league. We get this every summer. They buy a few players for a lot of money and everybody has a good wank about how well they're going to do this year. They always seem to find their level because the competition is a lot stiffer now than when Ferguson was in charge.
I wouldn't be getting too worried.
There is nothing we can do, to stop Utd giving us 'serious competition'.
The whole concept of this tends to be wrong on this forum. It's out of our hands, what Utd do. It's not about Sanchez, he is just the bloke they have signed now, it would have been someone else they signed, in the summer, who may or may ot have been younger, cheaper & better.
Utd are going to sign players. Sanchez may actually make it more difficult for them to improve or may make it easier, depending on what he actually does, when he plays, not on the fact of them signing him. But it was going to be Sanchez, or someone else in that position. And someone either fairly expensive or ridiculously expensive. Not 'nobody'.
Our job, is to build our team. And do the best we can.
If they can then compete, by spending billions on players, there is fuck all we can do about it.
But they were supposed to be better than us, this season.