Fathi was signed in January by former manager Neill Warnock, who resigned in May to be replaced by the former Manchester United and England striker.
However, the Blades new coach does seem to keep the Egyptian defender out of his plans as the 23-year old is yet to make an appearance under Robson's management.
"I don’t know why the coach is ignoring me, when he arrived I felt I was going to be a regular, but now I am not more than a reserve player," Fathi told FilGoal.com.
"I was excluded from the team's squad in every game we played so far this season, and if I can't find a place here then I will have to find another club soon."
The summer transfer window will close on Friday August 31st, but Championship clubs are allowed to loan players until November.
The former Ismaili ace ruled out a move to Zamalek, who have been persistently chasing his signature in recent weeks.
"There is no chance whatsoever that I could join Zamalek, I said this many times before and I say it again, I will not return to Egypt now," he insisted.