This will be a bitter-sweet update on Matt O’Riley at Brighton as the former Celtic fan favourite made his Premier League debut yesterday. Matt O’Riley was a huge fan favourite before he left Celtic for Brighton in a £25m+ deal in the summer. Unfortunately for the Denmark international, O’Riley suffered an injury on his Brighton debut in the Carabao Cup against Crawley Town in August. Now back in the Brighton first-team, O’Riley was brought on as a second-half substitute against Man City when The Seagulls were 1-0 down. And in the dying minutes of the game at the Etihad, the former Celtic midf…