That is according to Trevor Sinclair, who admitted that he had been "very critical of him and his concentration."
The 27-year-old Everton goalkeeper has started every match for the Three Lions at this summer's Euros.
And Pickford remains unbeaten between the sticks as he has now equalled Iker Casillas' record (five) for most clean sheets at one Euros tournament.
The England No 1 could surpass the Spain legend's record on Wednesday when Gareth Southgate's men clash with Denmark in the Euro 2020 semi-finals.
Burnley goalkeeper Nick Pope was tipped to challenge Pickford for his place in the England XI at Euro 2020 before he was ruled out with a knee injury.
Now, Sinclair has insisted that he is "pleased" that Pickford has been seeing a sports psychologist and believes the Everton star is reaping the reward.
"There's one thing I've been really impressed with, I heard the other day he's been seeing a sports psychologist, and that's Jordan Pickford," he told talkSPORT.
"I have been very critical of him and his concentration. Nothing personal about him, but from a goalkeeping view and his style of goalkeeping, what you need from a goalkeeper and his calmness.
"It's not been there in the past. I wasn't convinced he could keep clean sheets for us, do simple things well and keep his concentration.
"He's proved me wrong and he has done that and I'm pleased he's going to see a sports psychologist because he looks like one of the best goalkeepers in the world at the moment."
Manchester United legend Gary Neville has revealed that Pickford is his pick for "England's player of the tournament so far."
England destroyed Ukraine 4-0 on Saturday to set up their semi-final clash with Denmark at Wembley.
Featured Image Credit: PA
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