He has been an absolute sensation in the Bundesliga over the last two years, as he has begun to grow into his prodigious talents: at 21 years old, the only way to go is up for this young German-born Turkish prodigy.
With this signing, Madrid adds to its' growing (and very successful) arsenal of Germans with Turkish heritage--including Mesut Özil and Sami Khedira. If Sahin plays anything like either of his countrymen, then he will certainly find a very special place with los blancos.
This signing also represents Madrid's transfer policy since Mourinho: bring in young, talented, and relatively inexpensive players (Sahin cost 6 million Euros), and try to create the right combination that will gel on the pitch. So far, this has been a ringing success--with Özil and Ángel di María fast becoming superstars, and Sergio Canales waiting in the wings, Madrid seems to be stacking a midfield-of-the-future, much like Josh and I predicted at the beginning of the year.
It's also good to see Mourinho getting started on the summer signings: the sooner we get the roster nailed down, the sooner the players can start to gel together.