Amad Diallo is on loan from Manchester United.
The 19-year-old joined the Scottish Premiership leaders until the end of the season, a year after he moved to Manchester.
Diallo was signed by Manchester United in a deal worth $37.2m from Atalanta and has made nine appearances and one goal.
This move will be good for Diallo, as United believe he will be a part of the club's long-term plans.
Diallo could make his debut at Ross County, live on Sky Sports, and said that he was delighted to join Rangers until the end of the season.
It is great for me to be able to come to a club that is challenging on a number of fronts and will allow me to test myself in many environments.
I look forward to training with my teammates for the first time tomorrow and to meeting the fans for the first time at Ross County on Saturday.
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I am really pleased to add Amad to our squad for the rest of the season.
When the opportunity to sign him came up, we were very keen to make it happen.
He will add a lot to our squad and provide more competition for the players in the forward areas.
Ianis Hagi will miss the rest of the season after having knee surgery.
After moving to Italy at the age of 10, Diallo joined Atalanta.
The youngest player in the history of the game to score on his debut was 17 years old, and he did it in a 7-1 win over Udinese.
The Ivorian traveled with the Atalanta squad to Lisbon to face Paris Saint-Germain in the quarter-finals of the European Championship.
Papu Gomez likened the player to Lionel Messi after he impressed in training.
There are defenders in the first team that can't stop him. We have to kick him. Before Diallo moved to United, the captain of Atalanta said he plays like Messi.
After scoring his first goal for the club against AC Milan in the same competition, Diallo was handed his Manchester United debut.
Sky Sports' Dan Sansom.
One of the most exciting young prospects in the game is how Ole Gunnar Solskjaer described Diallo after signing him for Manchester United last year.
The 19-year-old didn't have a lot of first-team experience, but he quickly made a big impression.
Diallo can be found in either the No 10 role or both wings.
One of his strengths is his ability to play multiple positions in the final third.
His size is not an issue. An impressive dribbling ability and eye for the right pass are just some of the things the Ivorian has to offer.
Diallo is raw, but his enthusiasm could be key as Rangers chase a second consecutive title.
The clock is not running. The transfer window closes on January 31.
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