The 28-year-old has struggled to find the back of the net recently.
The 32-year-old has struggled for game-time for the Scottish Premiership side this season.
Tottenham appear to be the front-runners in the pursuit of the player.
Here is how we predict Sunderland and Arsenal will line up this weekend:
Allen has enjoyed some of his best form in the second half of the season.
Middlesbrough will face Ipswich Town in the Championship this weekend, while Huddersfield Town will take on Birmingham City.
The 21-year-old had been on loan at Walsall.
Leeds United are winning regularly and impressing with their overall play.
Rangers are reportedly keen to land Southend United goalkeeper Daniel Bentley.