Spurs have won only one of their last nine games, and have slipped from a comfortable third place to fifth place with four games remaining.
The Croatia international, out on loan at Bayer Leverkusen due to the fact that he could not command regular first-team football at White Hart Lane, feels that Redknapp should have shuffled his pack more to save key players.
“He didn’t rotate enough — that’s the main problem,” Corluka is reported to have said by The Telegraph.
“I watched almost every Spurs game and they played them all with the same 11, 12, 13 players and that’s why the players now are really tired. I wouldn’t be surprised if they finished sixth.
“They are three points behind fourth spot. They are fifth and it’s going to be really difficult for them.
“Yes, (the season will be a failure if they don’t qualify for the Champions League) especially because three months before they were in the title race challenging City and United.
“Tottenham, for me, had one of the best teams in England and of course it will be an unsuccessful season if they don’t go to the Champions League,” he concluded.
By Gareth McKnight