[1] Bos began his career at amateur club Sv Sempre Avanti and played from 1979 to 1983 in the academy of Vitesse.

[2] In January 2011 Bos was hired by Polish Polonia Warszawa's boss Józef Wojciechowski as a first team manager.

[4] In January 2012 he was forced to take indefinite leave of absence after he was diagnosed with pancreatic cancer; his place as head coach was temporarily taken by assistant Virgil Breetveld on an interim basis.

[5] After the end of the season it seemed like Bos would return to being in charge of the team; however, on 14 July 2012, it was announced that he had been forced to take indefinite sick leave due to his health conditions.

[7] Following his death, a special remembrance to honour Theo Bos took place at Gelredome with around 7,000 Vitesse supporters.