Jos Buttler has admitted he requires a radical shift in his approach to Test cricket following a string of failures in the conventional five-day format.
The England wicketkeeper-batsman had a stellar 2018 in Tests, racking up 760 runs across 10 games at an average of 44.70 but his form in red-ball cricket has since then fizzled out.
Buttler's woeful run of late has seen him average a miserly 23.14 over the last seven Tests, prolonging England's struggle to settle on a quality batting unit.
Reflecting on his underwhelming performances, the 29-year-old hoped to employ a more aggressive style of play - an approach that has seen him conquer the white-ball formats.
"I feel like I'm not quite performing to the standards I need to," Buttler was quoted as saying by ICC.
"I'm trying to improve that and affect games in positive ways for England."
"Since I've come back into Test cricket I've tried to trust my defense for longer periods of time. I've been able to do that occasionally. But [playing my natural game] is certainly something I'm trying to work out.
"You can do a lot of work in the nets but I'm spending a lot of time thinking about the game when I'm in my room or trying to visualise things or work through them in my head. Moving forward I've got to play the situation, but I will try to be a bit more positive."
While Buttler flopped in both innings during the Centurion Test, his South African counterpart Quinton de Kock claimed the player of the match prize for his valuable contributions.
De Kock was pivotal in resurrecting the Proteas' first innings with a quickfire 95 and followed it up with another breezy knock to set a daunting target to the visitors.
Buttler conceded watching de Kock take the game away from England "resonated" with him given the latter's freewheeling strokeplay.
"Quinton played a really good knock and put pressure back on the bowlers."
"He tried to take the initiative and, watching that from behind the stumps, it resonated with me."
Buttler said his position in the England batting lineup (No. 7) prevented him from taking needless risks.
"When you're batting with the tail, you try to sum up situations and work out how best you can score. You work out your risk management: what is too much risk; what is trying to push the game on. Looking ahead to this Test, I want to look to be a bit busier and try to look a bit more on the positive side."