Premier League proven not that many other options. Mata springs to mind along with a couple of others that probably wouldn't come.
Very few of the premier leagues best midfielders have been bought inside the premier league after being proven though, Kante, Mata, maybe a couple others like Cesc and De Bruyne after departing and coming back. I think for that money we could be buying world class players, for example James has gone to Bayern for 45m Euros, Bernardo Silva to City again for 45m. I'm not suggesting that these would of joined us just that i think there are better players out there than Sigurdsson for that value, something far more exciting and someone that would make us better than he in my belief ever could.
That said not my money and not going to cry if we sign him, still a good player.
What do you reckon?