Graham started his career with Chester-le-Street Town in the Northern League and Boro signed him up in 2003 as a 17-year-old.
The England U-20 striker scored an amazing 21 goals in only 20 outings for the Boro U-19 side in his first season. He then spent a successful loan period with Darlington where he scored his first league goal.
The former Newcastle trainee made his Boro debut as a substitute against Man Utd at Old Trafford in Oct 2004 and he scored his first Boro goal last season against Coventry in the Carling Cup. He netted his first Premiership goal with a header for Boro against Charlton Athletic, also last season.
Graham has also spent time on loan earlier this season with Derby County, featuring 14 times but returned to the Riverside Stadium at the end of February, where he has not featured for Steve McClaren's first team since a late substitute appearance in the 2-1 home win over Arsenal back in September.
Meanwhile, reserve defender Rui Marques, 28, has joined Hull City on loan until the end of the season with Leeds inserting a clause in the deal stating that the Angolan international will not be allowed to play against them when the two sides meet at the KC Stadium on Saturday, April 1.
He has made only one appearance for Leeds since joining from Portuguese side Maritimo in July 2005.