Leeds United are said to be in the race for the signing of a Premier League defender about to leave on a free transfer, but defeat in the play-off final has scuppered the club’s chances. The defeat to Russell Martin’s Southampton saw Leeds’ dismal record in the play-offs continue, the sixth time in the club’s history that Leeds have failed to secure promotion via the end-of-season tournament. Adam Armstrong’s 24th goal of the season has succumbed Daniel Farke’s men to The Championship for another campaign, at least. It will see The 49ers have to sell a couple of key players to balance the book…