Celtic secured the signature of Cameron Carter-Vickers from Tottenham with three minutes to spare of the deadline.
"Celtic Football Club is delighted to announce the signing of Cameron Carter-Vickers from Tottenham Hotspur FC on loan until the end of the season, with Celtic having an option to buy," a statement from the club read.
Cameron signed for Celtic on loan for the remainder of the season with an option to buy.
"I am absolutely delighted to agree this move to Celtic, it is a really exciting opportunity for me and I am desperate to meet my new team-mates and get going for the season ahead," he said.
"I know I am going to a huge Club which means so much to so many people and I will be doing all I can to bring our fans the success which their support deserves."