By realistic, are you claiming your choices are? @
Amadaeus
Yes. Perhaps number 5 is less realistic than the rest, but Lucas Moura is discontent with his playing time at Psg and he could want a move elsewhere. Same with Di Maria, with the introduction of Bale. Even though Ancellotti has found a way to incoporate him into the team via a central midfield role, their is a possibility that he could be displaced by Isco or Modric(with Alonso, khedira, or illaremendi holding) Nevertheless, on that option, I could not come up with any other noteworthy wide player at that time. So I am flexible for change in this area
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I don't think any of them are realistic to be honest. It may be in FM, but in real life.... not impossible, but it's far from very realistic. If we pulled any of the above, it'll be either a grand coup / steal / extreme amount of money.
Gundogan is highly rated, and Dortmund might be a better place to stay at the moment, especially if they made it far to the CL, considering we're not even in Europa league.
Mateo Kovacic - is about 20M price, but does Inter willing to sell? And I don't think he's ready to be the main man, he's still 20 IIRC
Luke Shaw - The most realistic out of all, and that's because he's English and coming from Southampton, going to be a solid player, but hardly a world class player and with Moyes, I doubt he'll gonna be World class any time soon
Lucas Moura - Enjoying good salary in France, don't think money is an issue for PSG anyway, they're in no need to sell
Mangala / Hummel - Top rated CB. Hummel like all German is more likely to prefer a German club, and he has a good prospect / challenge at Dortmund. Can't say much about Mangala but IMO he's also not ready at this moment, very good but not the week in week out solid first teamer that we need.
* Günogan contracts expires in 2015, so Dortmund would have to sell this upcoming window to recieve a good fee for him. Since, it is rumored we have been interested for awhile, I can not see why he would not be a realistic signing come this summer window. Not being in the champion league mighy be a blow like for most of our noteworthy signing, but he would be paid much more at United, playing for a more prestigious club with greater ambitious considering how one sided the German league is becoming.
Kovacic is barely getting any playing time and Inter or the Italian league is not as prominent as it used to be. He is a realistic target if Manchester Unuted shows interest. An article that might help.
http://bleacherreport.com/articles/1988124-transfer-target-who-will-rescue-mateo-kovacic-from-inter
I believe he is good enough to start consistent games. Like Pogba at Juventus who proved Sir Alex Ferguson wrong, Kovacic is very capable of becoming a main man in our midfield. He will get support from Fellaini, Powell, etc., so we will not be overly dependant on him.
**Funnily enough, I think Shaw would be one of the hardest to get considering interest shown by Chelsea. A club he admire. He is realistic though because he will be attainable this summer if a club make a bid. Basing this conclusion of real interest from more prominant clubs. Which would be enticing for a young chap like him. Nevertheless, if United get him, he will be a great catch considering his club preference.
***Mangala is attainable for a set price. He is a realistic target, but competition will be tough considering City interest. Hummel might stay with Dortmund, just for the reason that their would be too much exodus of star players in that club. The board and Klopp might not want to be viewed as a selling club, so the possibility of both Gündogan and Hummels leaving in the same window is small, unless a good deal is made. We have good depth in this area, so if Mangala does not seem ready, we are covered with Jones, Smailling and Evans. All those four are capable of vying for a starting center back role and I do not see any other club that has as good a depth in that area if these players aforementioned became our center backs options.