The 21-year-old goalkeeper joined Newcastle from Bolton Wanderers last year and spent much of last season training with the senior squad.
Reflecting on the time he spent with senior goalkeepers Dubravka and Darlow, Turner has insisted that the duo displayed the highest standard of training he has ever seen.
Heaping praise on Dubravka, the now Morecambe loanee pointed out how the Slovak remains consistent both on the pitch and in training, which he explained is an ‘eye-opener’ for him.
Turner was also impressed with what Darlow had to offer despite playing second fiddle to Dubravka and feels the Englishman has the qualities to be a number 1.
“It’s the highest standard of training I’ve ever seen, by a mile”, Turner told The Athletic.
“Martin is such a great keeper and he is ridiculously consistent, both on the pitch and in training.
“His standards never drop and it is an eye-opener for a young ‘keeper.
“It made me realise what I need to do if I want to succeed.
“Karl is also an excellent goalkeeper and he’s finally getting the chance to show it in games [in the absence of injured Dubravka].
“I’ve seen it in training, I’ve learned from it, and I know he’s a top ‘keeper.
“He can definitely be a No 1, not just a No 2, and he’s proving it.
“Opportunities don’t come around too often for goalkeepers but he’s grasped his.”
Turner is currently on loan at League Two side Morecambe to earn first team playing minutes and will be hopeful of challenging Dubravka and Darlow for the number 1 spot in due course.