Leroy Sane Made in Bundesliga (I liked when the bundesliga commentator said he was the most confident youngster ever after he dribbled past the keeper!)
He was made in Belgium. Guy torn our national leauge apart at the age of 19 by helping a team that never won anything to the top. Compare it to Crystal Palace winning the PL. I know, Germany is much better competition and it helped him a lot but still.
I think one of the biggest mistake Mourinho has made in his career is putting Oscar above De Bruyne at Chelsea. One would conquer Europe for the next decade whilst the other went straight to China at the first sight of money.