Dejan Kulusevski made his debut for "Spurs" already this weekend after the transfer from Juventus.
The Swede jumped into the FA Cup victory against Brighton, 3-1.
On Wednesday night, it was time for the Premier League debut, but it was not much fun.
Kulusevski jumped into the 76th minute when Tottenham led 2-1.
Six minutes later, all of a sudden Southampton were in the lead.
Norwegian Mohamed Elyounoussi nodded in 2-2 and shortly afterwards Che Adams sent in 3-2.
Tottenham had a ball in the net right at the end of the match through Steven Bergwijn.
The Dutchman thought he had made the redemptive equalizer but VAR showed that he was offside and the goal was ruled out.
Southampton won 3-2.