The front pair have an extra week to get healthy for the clash with the table toppers at Loftus Road as there is just the one Premier League game this weekend due to the FA Cup.
Zamora has come off the bench in the last two games and made a difference when on the pitch but he has yet to fully shake off the hip injury that has kept him out of the side.
New signing Remy has returned to training following a recurrence of a groin problem but he was not fit enough to face Swansea last weekend so he too will be monitored.
If neither are available then Redknapp will turn to Jay Bothroyd, who has recently returned to the club from a loan spell at Sheffield Wednesday.
“When Bobby doesn’t play we haven’t got a focal point to our play,” said Redknapp.
“Jay Bothroyd has come back from loan and he is the only other one who could do that so maybe he needs to be given a chance.”
St Johnstone manager Tommy Wright has accused Neil McCann of deflection tactics as he denied reporting the Dundee boss to the Scottish Football Association.