• Head coach caught on TV swearing during ‘grindathon’ against Argentina • ‘I don’t see any reason why I shouldn’t be frustrated,’ said Jones

Eddie Jones has defended his foul-mouthed outburst during England’s win over Argentina after he was caught by TV cameras venting his fury at his side’s laborious showing.

England managed two tries – one in either half from Nathan Hughes and Semesa Rokoduguni – in a lifeless showing that hardly impressed a near-capacity Twickenham. Jones’s anger was evident when he was shown on the TV screens during the match slamming his notepad and shouting, “How fucking stupid are we?” after a second-half penalty given away by Sam Underhill.

Asked about his televised rage, Jones said: “I haven’t seen it. How frustrated? Throwing stuff? That is pretty frustrated. We want to play well, we want to play good rugby, and I don’t see any reason why I shouldn’t be frustrated.”

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Jones conceded that England’s 20th win from 21 matches in his tenure will not live long in the memory and blamed their rustiness on a lack of preparation, particularly for his British & Irish Lions. “It was a grindathon, wasn’t it,” he said. “We were off the pace a little bit, but there were some things we did really well. The reality is we haven’t played a game since March together – we had players coming back from the Lions who had only done two training sessions, so our fluency and our understanding was not there.

“We had opportunities to score more points and we just couldn’t. Every time we created something a pass would go behind, a pass would go ahead, a pass would go to the wrong person. We just lacked that understanding – the good thing was we created some opportunities.”

Jones is likely to make changes for next Saturday’s fixture against Australia and Mike Brown will have to go through the relevant protocols after he was replaced midway through the first half after a nasty blow to the head. His opposite number, Joaquín Tuculet, was shown a yellow card for taking Brown out in the air. “He will have to do a return to play; he was hit pretty heavily,” said Jones. “We lose a player for the whole game, they lose a player for 10 minutes.”

In Brown’s absence, Anthony Watson switched to full-back and is likely to start there against the Wallabies if Brown is ruled out. Owen Farrell and Maro Itoje will also come into the picture after they were rested on Saturday.

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“We know how we want to play against Australia,” Jones said. “We’ve got a very clear vision of how we want to play against Australia and it should be fun. We are hoping Australia bring their absolute best game. These games are about seeing where we are at.”

Hughes also switched his attention to the Wallabies. He said: “It’s not a concern; we wanted to come out here and put in a good performance. There were a lot of opportunities that we didn’t finish off. We go back and review it, and we’ll have a look at Australia thoroughly, and we’ll be ready to go.”