Tonge, who spent three months on loan at Leeds from Stoke at the end of last year, has signed a two-and-a-half year contract after the two clubs agreed an undisclosed fee for the 29-year-old.
Fellow midfielder Paul Green missed last week's FA Cup draw with Birmingham due to the virus which has swept through the club in recent weeks, but manager Neil Warnock will be without an unnamed first-team player on Saturday through illness.
Another midfielder, Rodolph Austin, is also expected to return to contention after feeling unwell. The Jamaica international has only recently returned from a serious ankle injury.
Goalkeeper Paddy Kenny, skipper Lee Peltier, fellow defender Sam Byram and striker El-Hadji Diouf are all expected to return to the starting line-up after being named among the substitutes last week.