England could have wrapped up the five-match series with a victory at Trent Bridge, but a 203-run loss has kept India's hopes alive heading into the penultimate Test.
But at his press conference before England practice, the Yorkshireman revealed he was planning to put his left middle finger to the test again with the wicketkeeping gloves on.
Bairstow trained in front of the watchful eye of chief selector Ed Smith.
Bairstow picked up the injury while keeping during the third test but has been selected for the upcoming match with coach Trevor Bayliss saying he may be deployed as a batsman, with Jos Buttler taking over behind the stumps.
"I think one of our big strengths as a squad is our strength of character - and at home in particular, we're very good at bouncing back after hard weeks", he said.
Asked if that means he may still be behind the stumps as England try to seal the series by going 3-1 up, the 28-year-old said: 'It's up for discussion. I don't know how it's going to be.
JONNY BAIRSTOW is desperate to keep his grasp on England's Test-match wicketkeeping gloves, despite discouraging signs about his fitness during training in Southampton.More news: How to watch Aretha Franklin's funeral
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"You obviously want to play so, if I am not able to keep wicket, then I'd like to think I would play as a specialist batsman".
England will surely be wise to exercise caution in the immediate term, but the identity of their first-choice wicketkeeper for the winter and next summer's Ashes is more intriguing.
As for Bairstow's promotion in a reshaped top order, Root said: "I think he´s more than capable of batting in the top four".
"You're kind of entering into uncharted territory ..."
"I'm very, very keen to keep my spot as the keeper because I'd like to think it's gone pretty well over the last 38, 39 Test matches keeping for England". We can not be satisfied at all with one victory only, because if Nottingham was hard work this is going to be even harder.
Injury clouds weigh over Ben Stokes (knee) and Chris Woakes (thigh), meaning England could be left scrambling for another all-rounder.
Off-spinning all-rounder Moeen Ali and left-arm swing bowler Sam Curran have replaced top-order batsman Ollie Pope and pace-bowling all-rounder Chris Woakes, out with a thigh problem.