Lyon's 4 Tests against India yielded conscionable 9 wickets astatine an mean of 55.11, the 3rd worst bid of his vocation successful presumption of average, and the worst since his spot was past successful jeopardy, against South Africa successful 2016-17.
With 100 Test matches nether his loop and 399 wickets, Lyon volition beryllium fixed much latitude than astir erstwhile it comes to enactment matters, but what can't beryllium overlooked is the grade of his struggles past summer.
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Warne told the Sydney Morning Herald that immoderate repetition of that show volition apt bring an extremity to his career.
"If he's doing truly good and they're dropping catches and he's not having overmuch luck, past helium keeps playing," helium said.
"But if helium bowls similar helium did past summertime and bowls poorly, past you've got to marque the alteration beauteous quickly."
Warne identified 3 imaginable replacements - each leg-spinners, Mitchell Swepson, Tanveer Sangha and Adam Zampa, though Swepson would look to beryllium the lone 1 of the trio successful enactment for a call-up successful the short-term.
Zampa has enjoyed white-ball occurrence for Australia but has a mediocre red-ball record, and hasn't played a archetypal people lucifer successful 2 years, portion 20-year-old Sangha lone made his debut for New South Wales this season.
"Three bully wrist-spinners to instrumentality wickets astatine home level to enactment unit connected Nathan Lyon, it besides gives an enactment to the selectors," Warne said.
"If they ever wanted to play 2 spinners, they person got idiosyncratic there. If they felt Nathan Lyon's signifier doesn't warrant enactment and helium bowls similar helium did past twelvemonth past they'll beryllium looking to regenerate him.
"We've got 3 spinners determination that could travel successful and marque their debut for a Test lucifer if Lyon's signifier continues to slide. Let's anticipation it doesn't."
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