The Scotsman was also unimpressed with the food cooked up for the players: "The boys were scraping the cheese off the lasagne because it was that unhealthy".
Preston won just three out of their opening 15 league games before manager Paul Simpson was sacked in November and Davidson felt that was down to a poor pre-season.
"I think it cost us a good start although there was a gradual build-up of getting it back."
"For me it was disaster and eventually led to the end of Paul Simpson's spell in charge."
Callum Davidson will be talking about his career on BBC Radio Lancashire between 1905 & 2005 BST on Tuesday, 13 May.