Dearle was one of only four youngsters to be offered a development contract at the end of last season.
Peter is a defender, playing at centre-back and left wing back for Trinity in the first half of the season, after spending the first month of the season on loan at Daventry Town.
In June 2016, Dearle Teamed up with Diabetes UK to help raise awareness and inspire others living with the condition.
He will be in contention to make his debut this weekend when the steelmen travel to Belper Town FC.
Updated 21:32 - 18 Jan 2018 by James McCafferty