in his managerial career, he has been head coach of egypt, and has been assistant manager of the netherlands (under frank rijkaard and louis van gaal) and ajax (under ronald koeman). he became interim manager of ajax after the resignation of koeman. he was manager of ac ajaccio in france ligue 2 from 2006 to 2007. he returned as manager of egyptian giants zamalek in august 2007. he had previously managed them from 1994 to 1999, winning the egyptian cup in 1999, the african cup of champions clubs in 1996 and the afro-asian club championship 1997, the last two being the biggest club level prizes available to caf clubs. krol's return to zamalek was meant to be a stabilizing presence, the club having gone through several managers in the preceding two seasons.