A leggy midfielder who has impressed in a central midfield role, Willock was formerly on Reading's books.
However, he started out with Arsenal and he still has two brothers on the Gunners' books.
An acquisition in the summer of 2012, he was not deemed ready for Under-18 action in his first year but will be determined to push his way into the team after impressing at the Milk Cup in Northern Ireland.
Mostly involved with the younger age groups, he has been quietly learning his trade in the background at the Aon Training Complex and appears to have shot up in height, covering the ground in effortless fashion.
After initially being described as a winger, he held down a role in central midfield for Paul McGuinness' side, making an impressive start to the campaign. A key contributor with his energy and distribution, he got off the mark at Academy Under-18 league level with a superb long-range strike during the win against West Brom in October.