Rogne has been training with Celtic at their Lennoxtown complex
Celtic have confirmed the signing of Norway Under-21 central defender Thomas Rogne after the 19-year-old left Stabaek on freedom on contract.
Rogne has signed on a three-and-a-half-year contract, with his former club due a compensation payment.
Celtic manager Tony Mowbray said: "He's only 19 but has had good experience in the Norwegian league.
"Thomas has a bright future and will be training with the first-team squad and competing for a place in the side."
Rogne is the second central defender to be signed by Mowbray this month following the arrival of 26-year-old Dutch defender Jos Hooiveld from AIK Stockholm for a fee of about £2m.
Mowbray played down reports that Celtic were in line to sign Philippe Senderos on loan from Arsenal as they seek replacements in defence after the sale of Gary Caldwell to Wigan Athletic.
I'll be doing my very best to try and make an impact and ensure that I can achieve this as soon as possible
Celtic defender Thomas Rogne
He said that Rogne was not a "major signing" but was a significant one, perhaps an indication that the manager is looking to the long-term rather than immediate success from his new recruits.
"Sometimes you build the club with marquee players and other times you bring players in who you wait to blossom," Mowbray told BBC Scotland.
Norwegian Rogne has impressed on trial at Celtic's training centre over the past few days after leaving his former club in his homeland.
"Thomas is a young player we've watched for a while and we're delighted to bring him to the club," said the Celtic boss.
"We've had a chance to have a look at him in recent days at Lennoxtown and he's shown up well.
"He has all the physical attributes and personality to be a success at Celtic.
"Like Josh Thompson and Milan Misun, Thomas is a big part of our future plans in defence.
"We are bringing these talented players to the club in order to ensure the foundations are in place for the coming years."
Thompson, signed from Stockport County in the summer for £250,000, made his debut in Saturday's 1-1 draw at home to Falkirk.
However, Misun has yet to break into the first-team since being brought to Celtic Park from Dukla Pribram by previous manager Gordon Strachan last January.
Rogne, though, is determined to make a quicker impact with the Glasgow club.
"I'm absolutely delighted to sign for a club of Celtic's stature," he said. "It really is a dream come true to join such a famous club.
"I've already joined training with the first-team for the last few days and I have received a great welcome and have enjoyed very much working with the manager and players at Celtic.
"The Celtic first-team is where I want to be and I'll be doing my very best to try and make an impact and ensure that I can achieve this as soon as possible."
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