England won this year’s Six Nations before travelling to Australia and beating the Wallabies 3-0. They conceded 10 tries in the series, however, and Jones demanded defensive improvement.
“It’s not unfair criticism, it’s a critique,” Gustard said.
“If you take it personally, then it’s your ego and the game isn’t about us, it’s not about our ego, it’s about the players.”
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Gustard has since spent time with the New Zealand Warriors rugby league team and oversaw an England training session with professional judo coaches on Monday.
“I was looking at league’s defensive systems and stuff around the tackle,” Gustard said.
“There are transferable skills from judo. We missed 80 tackles in the series against Australia and that’s not good enough.”
England host South Africa, Fiji, Argentina and Australia in November and December in the Autumn internationals.