The duo worked with the QPR manager at Tottenham and the 65-year-old boss is plotting a reunion at Loftus Road as he continues to put his stamp on the relegation-threatened club.
Redknapp has already added Kevin Bond and Joe Jordan to his staff, though their appointments will not be officially confirmed until Mark Bowen and Eddie Niedzwiecki’s departures are approved.
Should Ferdinand and Allen join Redknapp, it would signal returns to the club for the two former favourites.
Ferdinand spent 12 years at Loftus Road, scoring 80 goals, while fellow striker Allen hit the net 40 times in 87 games for QPR.
Source: Newcastle United Mad