Third-placed Rangers kept up their promotion push with a 3-1 win at Ipswich and are currently five points adrift of leaders Leicester and one behind Burnley in second.
"It's going to be tight," said Redknapp.
"Leicester are in fantastic form and Burnley keep winning. They're not going to fade away like I keep hearing people say.
"Nottingham Forest and Derby will be up there as well. Teams like Wigan and Brighton are going to be there or thereabouts as well. It's a tough league."