"The guys started the season really well, but looking back they didn't recover from that Origin period," Lockyer said.
"Mentally, a few of the players are on record saying it's the most draining (Origin) series they had and it took it out of the seasoned pros.
"The younger generation (Broncos Origin debutants Matt Gillett and Ben Te'o) just didn't cope with it. It was a new experience for a lot of them and they will learn.
"The Broncos always have a high represenation during that period, but guys like Te'o and Gillett played their first Origin series and Corey Parker played a lot more Origin this year.
"No one saw it coming, but it's something the Broncos will be wary of this year and I think they can bounce back next year."