Stuart Broad says his biggest frustration over England's Ashes failure is the feeling that he has "not really done anything" in Australia.

Australia retained the urn less than halfway through the series when they hammered England by an innings and 14 runs in the Boxing Day Test at the MCG.

Broad was dropped in Melbourne, having taken two wickets in an emphatic 275-run thrashing at the Adelaide Oval after he and James Anderson were surprisingly omitted for the nine-wicket defeat in the first match of the series at the Gabba.

The 35-year-old has expressed his frustration over being omitted twice as the wounded tourists prepare for the fourth Test at the SCG, which starts on Wednesday.

"As a wobble-seam bowler, I feel as though I missed out on two of the best wobble-seam pitches in Australia," Broad wrote in the Mail on Sunday.

"Only playing once has made this a very disappointing trip, one that has not met my personal expectations.

"The biggest frustration is losing the Ashes, being 3-0 down and feeling like I've not really done anything. Not being able, as an experienced player, to influence a series while it's live is tough.

"But that is top-flight sport, and I am not the only one who will feel this way. Ollie Pope and Jonny Bairstow, guys who have played one or two games will feel the same, and it's part and parcel of touring."

Broad says he still has the desire to play for his country in the longest format despite such a painful tour.

He added: "Has it affected my hunger to play Test cricket? No. Looking at things pragmatically, I would argue that I won't get a better chance to take wickets than at Brisbane and Melbourne. But I must be ready for my next opportunity, whether that be in Sydney, Hobart or beyond.

"There is a long time between now and the tour of the Caribbean in March and I have never been one to make emotional decisions. So I'm not going to make any spur of the moment calls on my future.

"I feel fit, I've come back from the calf injury feeling strong and I'm taking wickets in the nets. That's all I can do given the lack of tour games and the tight schedule."

England have spent long periods in bio-secure bubbles during the coronavirus pandemic and Broad says the players are feeling the impact of restrictions imposed on them.

He continued. "This tour has taken its toll on all of us. Without sounding like making excuses, we may be at the end of our mental tether with Covid.

"We are the only team that has played solid international cricket throughout the pandemic and our multi-format guys had already done 50 days in a bubble before they turned up here.

"We spent day two of the Boxing Day Test match testing for Covid and having guys moving out of their hotel rooms, away from their families, so they were no longer classed as close contacts.

"When you are faffing about with external stuff like that, it drags your focus away from where it needs to be."

Under-pressure England head coach Chris Silverwood will be absent for the fourth Test in Sydney, having tested positive for coronavirus while he was already in isolation due to what was a seventh positive COVID-19 case in the touring party.