The promotion dream for Andre Ayew and Swansea ended after losing 3-1 in the second leg of the semi-finals of the Championship playoffs.
The Swans went into the second leg at Grifiths Park with a 1-0 advantage courtesy a late strike by Ayew.
Brentford started the game strongly creating several opportunities. The Bees were rewarded in the early parts after grabbing two quick fire goals by Watkins and Marcondes.
Mbeumo put the game beyond Swansea after scoring Brentford’s third early in the second half.
The Jack Army got a glimmer of hope in the last ten minutes after Brewster profited from an error at the back to reduce the aggregate deficit to just one.
Brentford held on to reach the final of the Championship play-off ending a good run this season by Ayew.
The Swansea vice-captain featured in 46 games, scoring 16 and assisting seven goals in the Championship this season.