Ollie Turton and Casper Hughes are set to be offered professional contracts at Crewe.
The youngsters made their first-team debuts towards the end of the Alex's 2-0 win over Stockport on Saturday and Gradi believes the pair will be able to make the step up to senior level.
"It was a real bonus and good for them that we were able to get them on against Stockport," he told the Sentinel.
"It was nice to see Casper show he could do it at first-team level. You do worry about him when you see his size, but he had two or three touches and did a nice little turn.
"He does what Lee Bell does, and a lot of the time he does it better."