Denny Johnstone departs Blues

Johnstone, 21, joined Blues in 2014 from Celtic making two Championship substitute appearances during the 2014/15 season.

Loan spells at Macclesfield Town, Cheltenham Town and Burton Albion followed that season with the former Scotland youth international scoring five goals in 20 games.

Last season, Johnstone joined Scottish Championship side Greenock Morton on a season-long loan scoring 17 times in 43 appearances.