 Grella's contract with Leeds United was due to be terminated later in the week so that Grella could sign a permanent deal and signed a deal that ran run until the end of the season.During his loan emergency loan move for Brentford, Grella made his debut in a 2-0 loss against Tranmere Rovers.Following his permanent move to Brentford, Grella made his debut in a 1-1 draw against Colchester United.