Due to a broken finger sustained during the third Test, Bairstow played only as a batter in the fourth match, while Joe Buttler handled the keeping.
Captain Joe Root expressed his confidence in Bairstow, stating that his consistent contributions over the past year and a half make him the right choice for the role.
This upcoming Friday marks the series finale, which also serves as the farewell Test match for opening batter Alastair Cook.
With a 3-1 lead following their win in Southampton this past Sunday, England has already secured the series victory.
Bairstow's injury reopened the discussion on who should be the primary keeper, particularly with Joe Buttler, the white-ball specialist, back in the Test fold since early summer.
There is a noticeable difference in their form: Buttler is often a more potent batter when he doesn't keep, while Bairstow actually performs better with the bat when he is wearing the gloves.
Interestingly, while Buttler hit his first Test century in Nottingham while covering for Bairstow, all of Bairstow's centuries in Test cricket have occurred while he was the team's wicket-keeper.
Speaking to BBC Sport at The Oval on Thursday, Root clarified, \"For now, I believe Jonny is the best fit for the keeping role. While things may evolve, this feels like the most logical approach right now.\"
Root added, \"Given the heavy schedule and the volume of cricket we play, splitting the workload across different formats is the smartest move to ensure our players stay fresh and injury-free in the long run.\"