via Express |
John, 22, is currently on a season-long loan with Rangers and his performances for the Scottish giants have alerted Leeds scouts.
He is out of contract at the end of the season and Championship rivals Cardiff could opt to sell in January, according to Football Insider.
The left-back position has proved problematic for Leeds since the departure of Charlie Taylor to Burnley.
Manchester United loanee Cameron Borthwick-Jackson has struggled for