Thorpe, 29, announced a return to action in February last year following his retirement in November 2006 after winning five Olympic gold medals Burberry men t-shirts, cheap burberry t-shirts for men 2012 outlet and 11 world titles.
But it has been a rocky road with his modest times a shadow of his former achievements, throwing into doubt his ability to qualify for the London Olympics with the Australian trials fast-approaching in March.
It failed to get any better at the Victorian state swimming championships where he finished seventh in his heat to miss Friday night's 10-man final at the Melbourne Sports and Aquatic Centre.
Thorpe, who swam the 13th quickest time of 51.05 seconds well behind fastest qualifier Matt Targett who clocked 48.86, played down his lack of form.
"It's too slow for where I need to be in a couple of months' time," he admitted, but insisted: "It's not a setback ... I think nothing of this.
"I'm happy with where I'm at in training. That cheap burberry purse hasn't translated into anything in competition yet, but a lot of people are reassuring me it will.
"I really wanted two swims today ... I'll have another swim tomorrow and hopefully I'll swim better in that."
Another Olympic champion on the comeback trail, Michael Klim, qualified seventh for the final with a time of 50.15.
A sluggish Thorpe turned last at 50m and could only make up one place on the way home, recording a slower time than the 50.84 he swam in Italy last month and a long way from his best of 48.56, swum in 2004.
He will contest the 200m in cheap burberry sweaters Melbourne on Saturday.