Republic of Ireland youth international who was named Walsall's 2016/17 Apprentice of the Season.
The Leicester-born left-back signed his first professional contract with Walsall in August 2016 and made his senior debut in a 5-2 Checkatrade Trophy victory over Grimsby later that month.
As well as captaining the Youth Team, the teenager helped the Development Squad win the Central League North West Division and the Walsall Senior Cup in 2016/17.
He was shortlisted for League One LFE Apprentice of the Year and received his first international call-up in April 2017.
Cockerill-Mollett was rewarded with a new contract that October, although injury restricted him to just one senior outing last season.