"I've worked with Avram before, he's not new to me," added Hart. "He helped me a great deal before with the academy."
Grant brings with him a wealth of experience having successfully managed both Maccabi Tel Aviv and Maccabi Haifa in his homeland, while also coaching the Israel national side.
He also led Chelsea to second place in the Premier League, runners-up in the Carling Cup and was one penalty kick away from bringing the Champions League trophy to Stamford Bridge in 2008.
Hart was a vital part of the successful youth setup at Leeds during the 1990s and has managed Chesterfield, Nottingham Forest, Barnsley and Rushden & Diamonds before he joined Portsmouth in director of youth operations in 2007.
He was appointed caretaker manager at Fratton Park following Tony Adams' sacking in February 2009 before being made permanent boss prior to the start of this season.
Due to the financial problems affecting the club during Alexandre Gaydamak's time as owner and the six-week reign of 10% stake-holder Sulaiman Al Fahim's, Hart was forced to sell a number of star players including Jermain Defoe, Peter Crouch and Glen Johnston.
In losing their first seven games, the team have made the worst ever start to a Premier League season and currently lie bottom of the table with three points.
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