Sir Matt Busby retires after 24 years as manager of Manchester United .
Sir Matt Busby is replaced by 32 - year - old reserve team coach Wilf McGuinness , a surprise choice after big names like Don Revie and Jock Stein had been linked with the job .
Sir Matt Busby retires after 24 years as manager of Manchester United and is replaced by 32 - year - old reserve team coach Wilf McGuinness , a surprise choice after big names like Don Revie and Jock Stein had been linked with the job .