The star is backing the Dore Programme which had previously claimed a 90 per cent success rate treating dyslexia, dyspraxia and ADHD.
It uses exercises such as catching bean-bags and balancing on a wobble board, which it claims stimulates part of the brain called the cerebellum.
But the controversial programme – founded in 1999 – has split expert opinion, with many claiming it is flawed.
Parents who originally paid up to £2,000 for their children to undergo treatment were left out of pocket when the firm went bust in 2008.
But Mr Logan, 42, who says Dore helped him overcome dyslexia, has returned as the face of the relaunched programme which now charges parents £1,500 to treat their children.
He said his nine-year-old son Reuben had gone through the programme: “Within a couple of months you do notice a good positive change in the child.”