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#4 Inigo Martinez (Real Sociedad to Athletic Bilbao)
Spanish center back Martinez might have been at Real Sociedad for almost 10 years, but this one's bound to leave a bitter aftertaste for their fans.
After Aymeric Laporte departed for Man City in a £57 million deal, Bilbao needed a big name to replace him, and they approached cross-city rivals Real Sociedad to activate Martinez's €30 million release clause.
Martinez first played for Sociedad's reserve team in the fourth division, helping them get promoted in 2010. In 2011, he made his La Liga debut and has been the first choice ever since, making 205 league appearances across six and a half seasons.
He even helped his team qualify for the Champions League after 21 years in 2012/13, making 34 appearances throughout that season.
He'll probably have to endure a few boos when he returns to the Anoeta with his new team, but every single Sociedad fan will acknowledge his incredible contributions to the club over the years.
