The 28-year-old moved to the Riverside in January from the Stadium of Light following a loan stint at Hull City.
The striker, who began his senior career at Middlesbrough, has failed to make a significant impact at Sunderland following his arrival from Swansea City last year.
"The honest truth is I haven't got a clue where my future lies beyond next week," the Northern Echo quotes Graham as saying. "I've still not spoken to anyone at Sunderland.
"Hopefully I can get a couple more goals before we go away for the summer and then we can reassess and see what everyone says and where my future lies."
Graham has netted five goals so far for Boro.