Eugene Bareman believes Diaz, who retired in the third round of his rematch with Lawler, needed far more time to prepare properly after six years away from high intensity training camps.
In his post-fight interview, the 38-year-old hinted that he had been pressured into fighting before he was ready.
Robbie Lawler (left) defeated Nick Diaz in a rematch 17 years in the making on Saturday
He said: 'I had a long time off and I knew I had it coming. I don’t know how this fight got set up. I had to switch up my whole management and set up, the way the fight got set up. It was just a bum rap. No excuses. I had it coming.'
His cornerman and former UFC fighter Jake Shields elaborated on Twitter when asked why Diaz only had six weeks to train.
He said: 'Wanted to do a fight