Avram Grant will take charge of training for the first time at Portsmouth on Friday knowing he has the backing of the supporters.
The former Chelsea manager replaces Paul Hart, who was sacked on Tuesday with the club rooted to the foot of the Barclays Premier League with only seven points from 13 games.
"It is good for the club. He is very experienced and has the ability. He also has good contacts and knows what he is doing," Nigel Tressider, chairman of the official Portsmouth supporters club, told Sky Sports News.
"Hopefully the new owners will give him the money for players he needs to strengthen the squad and keep us in the Premier League."
Portsmouth have no doubts Grant can rally the players.
Chief executive officer Peter Storrie said: "Avram is a very experienced and respected manager who has managed at the highest level.
"The board believes he is the man to help steer the club out of the relegation zone. He will take charge of training on Friday alongside first-team coaches Paul Groves and Ian Woan."
Former England midfielder Paul Merson, who had a spell at Portsmouth, fears for the club's status.
He said: "I am shocked and surprised. They had a great team spirit even though they were bottom. This could go completely the other way and turn things upside down.
"Paul Hart brought players in, who were out of favour at their clubs, and gave them a second chance. Now he is gone I am worried for Portsmouth. I could see them getting out of trouble, now I am not so sure."
Hart, meanwhile, confirmed on Thursday night that he has rejected the club's offer of a return to his former role with the youth set-up.
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