It's very sad and regrettable that a quality players as varane will be leaving Manchester united without leaving up to the hype and expectations when he initially sign for the club, but I still feel he is still a very good player, he just came into a club in Crisis, which made almost all his wrong decisions scrutinized at every given opportunity, and I believe that he will not be the only big name player leaving the club, their will be so much more, and during this summer, I also think that the manager will also be shown the exit door, because he has largely under performed this season, and someone's head must go for it.
Varane is no longer a good player, he often injured and didn't give a big contribution whereas his salary is second biggest in Manchester United. It's better to release Varane and looking to hire other cheaper players. Varane also didn't get selected in France national team, he's just a mediocre player.
It is surprising if Man United really wants to sign Joselu. Although Joselu is an experienced striker, he is still an average striker. I think it is because Joselu has a cheap market price, so Man United doesn't need to pay a lot of money for him. Moreover, the chance to sign Joselu is high because Real Madrid will sign a new striker in the next season. With the tactics of Ancelotti that doesn't many many strikers, Joselu is probably not needed to stay in Real Madrid squad anymore.
Manchester United recently signed few old players that willing to get paid less like Amrabat and Evans, that's why they also interested with Joselu. But I think Joselu will not perform in Manchester United, there's a big gap the quality between Real Madrid's midfielders and Manchester United's midfielders.