New Nottingham Forest boss Sean O'Driscoll described his return to the club as "an easy decision to make".
O'Driscoll spent five months as first-team coach under Steve Cotterill before departing the npower Championship outfit in May to take the reins at Crawley.
But the 55-year-old's stint in West Sussex did not even take in a competitive match as he was lured back to Nottinghamshire on Thursday night, selected by new owners the Al Hasawi family as the perfect replacement for the sacked Cotterill.
And O'Driscoll said: "It was an easy decision to make to return to Nottingham Forest."
He added: "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 Alan Williams was willing but reluctant to bid O'Driscoll farewell after just two months in the job.
"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 Steve Coppell and head coach Craig Brewster will take over team affairs for the time being.