West Ham United, Leeds United, Cardiff City and Derby County have all played their part in blockbuster finals.
Blackwell was dismissed after just over two years in charge.
The former Manchester United goalie coach is currently at Cardiff City.
Brian McDermott has brought former Leeds goalkeeper Neil Sullivan onto his coaching staff at Elland Road.
A former Tottenham Hotspur and Chelsea goalkeeper has sealed a 'dream' return to the club where he began his career.