Postecoglou's Spurs seal Burnley's relegation fate
Burnley's relegation from the Premier League was confirmed as a late Micky van de Ven winner clinched a 2-1 home win for Tottenham Hotspur.
Vincent Kompany's men had to win at Tottenham Hotspur Stadium to keep survival hopes alive, and it looked possible when Jacob Bruun Larsen fired the Clarets ahead in the first half.
However, Pedro Porro struck to level, before Van de Ven rifled home with eight minutes to play to condemn Burnley to the second tier and boost Spurs' UEFA Champions League hopes.
It's a result that ends Spurs' run of four straight defeats and leaves them four points behind fourth-placed Aston Villa with two games to play.
Burnley nearly got in front after just five minutes, but Guglielmo Vicario was equal to Vitinho's header, while Brennan Johnson saw an effort well-saved by Arijanet Muric up the other end in a frenzied start.
The Clarets took the lead with 25 minutes played, persistent work from Sander Berge allowing Bruun Larsen to latch on to the Norway international's throughball before slotting past Vicario.
Burnley's lead didn't last long, though, Porro driving into the box before unleashing a powerful finish into the back of the net.
Wilson Odobert nearly restored his side's advantage after the break as his thunderous effort was tipped over by Vicario as Burnley looked for a lifeline.
Muric kept out James Maddison at the other end with a brilliant stop, before also denying Kulusevski with Spurs looking to turn up the heat.
The hosts did find a winner late on, Van de Ven taking the ball into the penalty area before coolly slotting home to send Burnley down and keep his side's slender top-four chances alive.
A run of just one Premier League defeat in nine games across March and April had given Burnley some slender hopes of survival, but it was simply left with too much to do as defeat at Spurs ensured it would be playing second-tier football next season.
After romping to the Championship title last term, some had lofty pre-season hopes for Burnley, but the Clarets have won just five league games all season, not enough to keep them in the division.
Burnley's relegation is its fifth from the Premier League, and Kompany has work to do if it is to bounce back in similar one-season fashion as it did so impressively last term.
It appeared Spurs would stumble further with a home draw against a bottom-three side, but Van de Ven's crucial late winner has somewhat turned the heat up on Aston Villa ahead of its games against Liverpool and Crystal Palace.
Postecoglou's men accumulated 2.5 xG (expected goals) to Burnley's 0.75, and Van de Ven's strike means Spurs have now won eight of their nine Premier League home meetings with Burnley.
The result also ensures Postecoglou avoids becoming the first Spurs manager to lose five top-flight outings in a row since Osvaldo Ardiles in 1994 (seven).