Sunderland have already been promoted from League One to the Championship, courtesy of a 2-0 victory over Wycombe Wanderers last weekend, and the remaining two finals take place today (Saturday) and tomorrow.
The big Championship clash kicks off at 16:30 BST on Sunday afternoon, as Nottingham Forest face Huddersfield Town with a Premier League spot up for grabs.
Often described as the 'most lucrative game in football', the final allows Forest to complete a remarkable turnaround since Steve Cooper's appointment as manager, as they were in the relegation zone in the early part of the season.
Garner has been a vital part of the progress, performing with real maturity and responsibility in a key midfield role, and he helped his loan club overcome Sheffield United in the semi-final, with a penalty shoot-out eventually required to decide the outcome.