Sunderland boss Roy Keane hopes to make "two or three" more additions to his squad before the summer transfer window shuts.
"Greg Halford went down injured three or four days ago and that meant Dean had to do a job at right-back. We played Ross at left-back, and Ross is really a left winger.
"Every club will have situations where they have call on one or two players to do a job, but I still think we're a bit light in one or two areas."