The versatile 26-year-old can play anywhere down the left side and although has been used in defence by the U's so far this season, has played in midfield and as a winger for the club in the past.
Marvin Johnson of Oxford United applauds the fans.
Johnson has previously attracted the interest of Derby County and Leicester City, but it is Hull and Leeds who now lead the way.
The Hull Daily Mail reports that it will cost around £2m to prise the former Kidderminster Harriers man away from the Kassam Stadium and it remains to be seen whether either Championship club are prepared to pay that.
The Tigers are desperately seeking a new left-back after losing both Andrew Robertson and John Tymon over the summer to Liverpool and Stoke City respectively.
Max Clark has been filling in there so far in 2017/18, while the Whites after looking for competition for Manchester United loanee Cameron Borthwick-Jackson and Gaetano Berardi - who has been playing there despite generally being considered a right-back.
Gaetano Berardi of Leeds United rides a tackle from Matty Cash of Nottingham Forest.