Parkinson, who made his international debut against New Zealand in 2019, faced criticism at the time over a perceived lack of pace and had his technique thoroughly dissected by critics and pundits around the world.
"I'm sure you will ask about it," he told the Telegraph. He admits he was stubborn to change what had worked for him but has added the ability to produce extra pace through the air to his bowling after working with Patel.
"I'm not sure it was the ball of century just yet," he says. "I tried to fire it in quite quick. He had been sweeping me quite well but the work I have done in the winter meant I could fire it through a bit quicker and it just clipped the edge of the rough.
"As soon as he went back I thought I'm good here. Luckily it pitched six inches outside leg and hit off."
As well as working with Parkinson on varying the pace of his deliveries, Patel had him bowl numerous net sessions to England's best ever player of spin, Joe Root.
That work seems to have paid off for Parkinson who is now back in the England selector's minds ahead of tests against New Zealand and India in 2021.
Patel played 24 Tests for New Zealand, his opportunities limited by the presence of Daniel Vettori, and forged a successful career in county cricket bowling off spin for Warwickshire.
He has worked extensively with England's spin bowling contingent over the English winter and has been credited with helping the side's premier spinner, Moeen Ali, rediscover his form.
- with The Daily Telegraph UK