Goalkeeper Mark Brown has moved from Inverness Caley Thistle to Celtic for an undisclosed six-figure transfer fee.
Brown has signed a three-and-a-half year deal at Celtic Park
And the 24-year-old has penned a three-and-a-half-year deal with the Scottish champions despite coming as cover for first choice Artur Boruc.
He said: "I thought about it before I came, but the chance to come to a club like this doesn't come around often.
"I think I'll improve as a goalkeeper here. All I can do is work hard and try to push for a first-team place."
Brown's contract with Caledonian Thistle was due to expire in the summer and Falkirk and Hibernian were both reported to be chasing his signature.
"I had been speaking to Falkirk in previous weeks," he said. "But, when a club like Celtic comes in, I don't think there are many people who say no.
This is the biggest transfer fee this club has ever received
Inverness director of football Graeme Bennett
"Artur Boruc is a fantastic goalkeeper and he has been playing brilliantly. It's going to be difficult.
"But Gordon Strachan said he had been impressed when he watched me and he wanted to bring me to the club and I wanted to take up that challenge."
Brown, who started his career with Rangers before moving to Motherwell then Inverness in 2002, does not believe that the move will also hinder his international chances.
"If I'd stayed at Inverness, maybe I would have got the call-up," he said.
"But I think, in the long-term, this will benefit my career more."
Inverness director of football Graeme Bennett thought that it had been better to sell Brown now.
"It makes sense to sell now rather than have Mark sign a pre-contract deal and leave us with no compensation," he said.
"This is the biggest transfer fee this club has ever received and Celtic have conducted their business very properly.
"Mark jumped at the chance to go to Celtic Park and perhaps be involved in the Champions League."
Celtic manager Strachan moved for Brown after sanctioning David Marshall's loan move to Norwich.
Marshall found his route to the Celtic first team blocked by the impressive form of Poland international Artur Boruc.
Inverness manager Charlie Christie will give Brown's long-term understudy, Michael Fraser, the chance to step up.
"Michael did well at Celtic a couple of months ago and he's a very good keeper who has worked with Mark for four years," said Christie.
"He'll play against Hibs on Sunday and he'll get his chance.
"But that leaves us a keeper short and we're looking around to bring one in."