Hiram Boateng will be on loan at Plymouth Argyle from Crystal Palace until January.
Hartley is a lower league veteran, having represented the likes of Hartlepool United and Stevenage before moving to Home Park, and he has been very impressed by Boateng's showings.
The 19-year-old Palace youngster has moved to Plymouth on a loan deal until January, and it seems that he has made a positive impression on his new employers.
"He’s a good lad, that’s an important thing," Hartley said. "He wants to learn; he’s got good character; he’s a good person. He’s 19 years old, and some of things you see him do in games...I forget how old he is. He looks like a 28 or 29 year old player, when he’s only 19.
"If he keeps improving and keeps a level head, I think he could go all the way."
Boateng has played 13 times for Plymouth already this term, with the midfielder becoming a prominent part of their starting line-up.
During that time he has scored once, with his performances helping Argyle to climb to the top of League Two.
Plymouth have been in formidable form so far this season, and Boateng will be hoping that he can continue to help his temporary club establish their place as a candidate for promotion over the remainder of his loan spell.
Boateng has made two appearances for Palace to date, both in the FA Cup, but there are still high hopes for his future at Selhurst Park.