3. Frank de Boer
The former Ajax and Barcelona defender has done a brilliant job at Ajax, another club which has a big place in footballing folklore. De Boer has won the Dutch league 4 times in a row and has the big match experience as he was the assistant coach of the Dutch national team during their 2010 run at the World Cup final where they lost to Spain.
De Boer is only 44 years old, so he would fit the policy at FSG of getting a young manager. His team does play a good brand of football and he was courted at one point to come to Tottenham, he may not move to London but Liverpool could come calling soon.