Nottingham Forest has appointed former first-team coach
O'Driscoll, whose previous clubs include AFC Bournemouth and Doncaster Rovers, worked under previous Forest manager
The Kuwaiti-based Al Hasawi family sacked Cotterill shortly after taking control of the club and were linked with moves for a string of big-name bosses, including
"We interviewed many well-known and high profile figures but we truly believe
"Sean's passion for Nottingham Forest, knowledge of the game and the Championship in particular, plus his work ethic, shone through in our conversations. We are delighted to welcome Sean back to the club. He has our total support and we are looking forward to a long and successful relationship.
"He is hugely respected, not only by members of our current squad and staff at the club for his work in helping transform our fortunes last season, but also within the wider football community."
"I enjoyed my time working with the players last season, and even in sometimes difficult circumstances the fans gave the kind of support you don't often see in football today.
"The Al Hasawi family's ownership opens exciting prospects for this club and I look forward to rebuilding the squad and playing the kind of attractive football the City Ground deserves to see."
Crawley chief executive
"The club is extremely disappointed to be losing Sean so soon after he came to Crawley Town, but our policy has never been to stand in the way of any employee who feels they would prefer to pursue a role at a different club." he said.
"We would like to thank Sean for his efforts during his time at the club and we wish him all the best for the future."
Crawley director of football
An Edin Dzeko double and a late Micah Richards winner helped Manchester City secure an astonishing 4-3 win over Chelsea in St Louis.