In 1991, successive promotions led Notts County and Warnock to the top flight. He was offered the Chelsea job, but stayed at County, who were relegated and he was sacked. It took Warnock 14 years to return to the top flight.
The Scot had a decent reputation at Preston when, in 2001, Alex Ferguson asked him to become his assistant. Moyes turned down United, and a year later became Everton manager.
Mourinho was on the staff at Barcelona in 2000 when his mentor, Bobby Robson, asked him to be his assistant at Newcastle. The Portuguese said no and became coach at Benfica instead. Thus began a remarkable career.