Rangers climbed back into second place, five points behind leaders Leicester, after Charlie Austin's second-half double secured a narrow 2-1 win over Huddersfield on Saturday.
"It's going to be tight," said Redknapp.
"There are so many teams up there. It's going to go all the way. You can't afford to slip up because every week is difficult.
"We've just got to keep it going, got to keep grinding out results. There's not been too many weeks where I could sit back and relax.
"Every game has been going down to the wire and (Huddersfield) was no different."