Pros—Scouts who have seen this youngster play for Dinamo Zagreb have not been disappointed.
Still just 17, he's played eight times this season for Dinamo Zagreb in the PRVA HNL (Croatian First Division), and scored three goals. He's also the youngest goal scorer in the PRVA HNL too, which says quite a bit for a league which produces players like Luka Modric and Niko Kranjcar.
If one ever needs to wonder about pressure, then the derby of Dinamo Zagreb vs Hajduk Split makes Man Utd vs Liverpool look like a schoolboy's kick-about. Were he to don the United shirt, he might etch his name in history alongside that of Paul Scholes.
Likened to Luka Modric, Mateo Kovacic has already earned rave reviews from some of the scouts and coaches in Croatia, even likening him to Robert Prosinecki. His age makes him an ideal target for Manchester United who usually buy young players and in-turn develop them, and he might be seen as an ideal ball-carrying playmaker like Luka Modric.
Cons—A relative unknown with no Premier League appearances, the move might in some ways hinder him than help his growth as a footballer. There are various examples of promising youngsters heading abroad to big clubs, only to never fulfill their potential.
Also, it remains to be seen whether he would be able to adjust to the pace and physicality of the Premier League. There also remains to be seen as to what would happen to Paul Pogba and Oliver Norwood were he to arrive.
Verdict—Sign him. With Arsenal and Juventus closing in on the player, a huge offer on the table can sweep away competitors for his signature. He's also openly stated his desire to move to England more than Italy, were he to leave his homeland.
A figure of anywhere close to 10 million Euros would be ideal to chase away competition and land his signature.
Javi Martinez is seen something similar to Xabi Alonso and has also played with the Spain U-21, has a World Cup winner's medal as well, but I'd still go with Kovacic, as he'd provide a very different aspect to United's overall play.