This year’s Championship play-off will be played between Swansea and Brentford.
Swansea were held to a 1-1 draw by Barnsley on Saturday.
However, the Welsh club had defeated their opponents 1-0 in the first leg of the semi-final tie.
Matt Grimes scored in the 39th minute, before Cauley Woodrow levelled for the visitors in the 71st minute to set up a frantic finish.
The Swans, who finished fourth in the Championship, last played in the top flight in 2017/2018.
Earlier on Saturday, Brentford fought back from one goal down to beat 10-man Bournemouth 3-1 in the second leg and advanced 3-2 on aggregate.
The Championship playoff final will be played on May 29.