"He comes highly recommended by people in the Swedish game. We have had him watched for a year or so, and all the reports have been very positive, and I know Mohamed is excited about joining the club.
"He's a young player and someone with great enthusiasm for Celtic and for the challenge ahead, and we're really looking forward to welcoming him to the squad."
Bangura meanwhile feels no additional expectation after signing for the Hoops following a recommendation by Henrik Larsson.
Bangura told the club's official website, www.celticfc.net: "It is very flattering to be recommended by Henrik Larsson, and it's a very good feeling.
"I know all about Henrik and what a great player he was for Celtic, and I'm looking forward to joining up with my new team-mates and working hard to do well at Celtic and help the club be successful.
"But I don't feel any pressure.
"I'm just very happy and I'm looking forward to the move.
"I am delighted to be joining a club the size of Celtic."
Bangura is Celtic's fifth signing of the summer transfer window, following the arrivals of Adam Matthews, Kelvin Wilson and Victor Wanyama and the loan deal for Fraser Forster.
He will join up with the Celtic squad following the international break, during which he is expected to play for Sierra Leone against South Africa.
