Australia spinner Nathan Lyon has been ruled out of the remainder of the Ashes series.

Lyon suffered a “significant calf tear” while fielding on day two of the second Test at Lord’s, which his side won in thrilling fashion to open up a 2-0 series lead.

Australia just need to avoid defeat in the third Test at Headingley this week to retain the urn, but must now do it without their 496-wicket spinner.

Eager for runs to add to England’s second-innings chase, Australia sent a stricken Lyon out to bat late on Saturday afternoon, with images of the 35-year-old limping out to the middle sure to go down in Ashes folklore.

As it happened, the 15-run partnership he put together with Mitchell Starc were not needed as Australia won the Test by 43 runs, but the memories of Lyon’s bravery will endure.

Todd Murphy is Australia’s spinning replacement for Lyon, with the 22-year-old working closely with Lyon behind the scenes in readiness for this moment.

“His stock ball is good enough in international cricket. We have seen that in India in arguably the hardest place to bowl spin,” Lyon told Cricket Australia’s official website.

“It will be a different challenge with the England batters. If they do come at him, it provides Todd with a decent challenge. But a chance to leave his footmarks here in England. It is a big Ashes series, he is excited by the opportunity.

“I sat with Todd in the last session there (on day four) and spoke about spin bowling as we do. I have a lot of confidence in Todd. He is a great kid. He is willing to learn along the way,” Lyon said.

“I have told him my phone is always on, it doesn’t matter if I am sitting in the changeroom with him or I am sitting at home watching it in bed.”

Nathan Lyon’s chances of playing any further part in the Ashes looked to be in doubt after he arrived on the third morning at Lord’s on crutches.

The Australia spinner had to be helped off the pitch on Thursday evening after pulling up with an apparent calf problem as he fielded in the deep.

The 35-year-old, playing his 100th consecutive Test, looked distraught as he hobbled around the boundary edge with question marks immediately raised over his continued presence on the tour.

He joined his team-mates at the ground on Friday morning, but his reliance on crutches and the presence of a compression sock told its own story.

It now seems almost impossible that he will be play a role in ongoing match, while the three-day turnaround before the third Test at Headingley means that must be highly unlikely too.

Cricket Australia’s medical staff are monitoring Lyon but offered no official update as he battles to save his series.

Steve Smith admitted he was not optimistic when asked about the injury at the end of day two.

“Obviously it didn’t look good,” he said.

“I mean it doesn’t look ideal for the rest of the game. I’m not sure how he actually is, but if he is no good, it is obviously a big loss for us.

“Fingers crossed he is okay but it didn’t look good.”

Australia have three part-time spinners who may be asked to pick up a share of the workload over the next three days, with Smith joined by Travis Head and Marnus Labuschagne, but should Lyon be ruled out of the next match Todd Murphy is in line for promotion.