Carra is convinced Suarez's latest biting episode has come after being away from the environment at Liverpool.
He wrote in the Daily Mail: "The signs last season had been encouraging. He was booked only six times (compared to 11 times in 2012-13) and benefited from a philosophy Brendan Rodgers calls 'match management'. He wants players to remain calm and focused at all times.
"Dr Steve Peters goes to every Liverpool game for a variety of reasons but part of it is to analyse 'impulse management' and he will study how players react in pressure situations. The system worked last year because Liverpool topped the fair play league.
"But away from that environment, he has lost focus and if I'm honest, I don't believe he will change. He will always have that tendency to self-destruct. This latest incident mirrored the ones with Ivanovic and PSV Eindhoven's Otman Bakkal - it was a split-second reaction, instinctive."
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