By Alex Stevens

Three Championship clubs are ready to rival Celtic and Rangers for the signing of Danny Graham, according to a report.

Graham, 30, is set to leave Sunderland this summer as a free agent and the Scottish giants are both keen to convince the striker to move to Glasgow.

The Sunderland Echo claim Championship trio Birmingham, Preston and Wigan are also keeping close tabs on the striker.

Graham has spent the second half of the season on loan at Blackburn and is said to be keen to return to Ewood Park, although that will depend upon the new manager.

Football Insider revealed earlier this month that Rangers boss Mark Warburton is monitoring Graham’s situation and has already made contact with the forward.

Rodgers has twice worked with Graham, at Watford and Swansea, while Warburton is also well acquainted with the striker from their time at the Hornets together.

Graham finished as top scorer at Watford and Swansea in his first full seasons at the clubs, but struggled to make an impact at Sunderland when he signed for £5million in January 2013.

The striker has scored just once for the Black Cats in 42 appearances, but has been able to regularly find his scoring touch while out on loan at Hull, Middlesbrough, Wolves and Blackburn in recent years.

The former England Under-20 international has scored seven goals in 18 games at Blackburn, whom he joined on loan in the January transfer window.

Graham’s return to form has made him an attractive prospect as a soon to be free agent and a number of clubs are investigating whether he would be open to taking a pay cut on the £35,000 salary that he currently collects at Sunderland.

Rodgers has made signing a striker a priority this summer as he looks for a worthy partner for Leigh Griffiths who smashed in 40 goals in all competitions this season.

In other Celtic news, the Hoops have finalised a deal for an attacker.