Jos Buttler warns he is unlikely to single-handedly “fix English cricket” as he prepares to take a step into the unknown.

Buttler believes, contrary to doubts he expressed less than two months ago, that he is ready for a debut Test as England’s new wicketkeeper-batsman.

The 23-year-old appears wary nonetheless with some suggesting he alone could be the answer to all England’s ills as Alastair Cook’s team tries to overturn a 1-0 deficit against India and halt a miserable run of seven defeats in nine matches.

Buttler’s chance has arisen following Matt Prior’s announcement, in the aftermath of Monday’s Lord’s defeat, that he will take the remainder of the summer off because of injury.

After 69 limited-overs caps, dating back almost three years as he has established himself as a first-choice selection in short formats, Buttler is set to achieve his “ultimate goal” of a Test career.

His ability to turn matches on their head with clean, calculated and inventive hitting — especially after his brilliant maiden international hundred against Sri Lanka at Lord’s at the end of May — has raised awareness of potential in Test cricket too.

He, however, is wary of fuelling uneducated assumptions that he will simply turn up at the Ageas Bowl tomorrow — scene of the third Test and, coincidentally his maiden first-class century four years ago — and immediately bail out ailing England with bat and gloves.

“I’m not coming in expecting to be the one person who can fix English cricket unfortunately,” he said.

“It’d be great if I can. That would be brilliant.

“But I’m just coming in determined to be authentic, be myself, enjoy the occasion and look forward to helping England put in a performance.”

Buttler admits it is an advantage not to have been a part of the team during their struggles up to now, while enjoying a familiarity with England teammates as a limited-overs regular.

“I come in pretty fresh,” he said.

“Obviously I haven’t been involved in Test cricket before, so I come in without that baggage.

“For me, it’s going to be such a great occasion and I’m determined to get the best out of myself on Sunday.”

He will not be meeting any teammates for the first time here.

“I think that makes the transition a little bit easier for me,” he added.