Juande Ramos made a number of big-money signings last summer but Spurs endured a disastrous start to the campaign and the Spaniard was replaced by Redknapp.
The new boss ventured into the winter transfer window to bolster various departments, with the likes of Carlo Cudicini, Pascal Chimbonda, Wilson Palacios, Robbie Keane and Jermain Defoe all arriving at White Hart Lane.
Spurs would appear to have greater depth to their squad and the results have been promising, with European qualification still a target.
However, Redknapp is already planning for the future and believes he will have to bring in more new faces.
He may therefore have to let some players go and speculation has surfaced regarding the futures of David Bentley, Darren Bent, Gareth Bale, Roman Pavlyuchenko and Tom Huddlestone.
"In the summer, I want to strengthen the squad a little bit in one or two areas," Redknapp said in the Evening Standard.
"There will be one or two lads who are not playing who will want to play.
"Those who are not in the team at the moment will not be happy.
"We are looking to bring one or two in."