The Pescara striker is also wanted by Napoli and Juventus.
The Italian striker is something of a cult figure for Rangers.
The forward scored a hat-trick against Arsenal on Saturday to boost his chances.
The Tigers have been on a poor run of form of late, as they have lost ground on the automatic promotion spots.
Rangers boss Mark Warburton doesn't want to unsettle his summer transfer targets.
The Whites lost 1-0 at Burnley on Saturday afternoon.
Leeds United lost against Burnley in the Championship on Saturday afternoon.
Slaven Bilic has praised West Ham striker Andy Carroll for his performance against Arsenal.
Burnley beat Leeds United 1-0 this afternoon.
Leeds could have taken something from the game if Chris Wood had taken his chances.
The St James' Park outfit have wished one of their most loyal servants good luck.
We cannot wait to watch this, but we do wish that Roy Keane was around to take on Patrick Vieira for one last time.
Chelsea manager Jose Mourinho has addressed the media ahead of their Premier League clash with West Ham United.