Spurs sit just three points above the relegation zone and have sacked manager Thomas Frank earlier this month as the club try to climb away from the relegation zone.
Frank stepped in for Postecoglou who lifted the Europa League with the side last year and managed to bring the best out of Tottenham in Europe whilst also failing domestically.
One key player during that success was Romero who Postecoglou says he admires but is also wary of due to his aggressive style and take no prisoner's attitude.
"I like him, man, and he does play aggressive, but he really scares people in practice. I like the way he talks. Now, does he cross the line? Yeah, he does. You know, he sometimes crosses the line in practice, and the coaches say, 'Oh, you know,' I say, 'Well, you guys tell him. I'm not going to tell him.'”
"I mean, would you rather have Roy (Keane) in your team or against you? We would never have won that final without Romero.
“Before kick-off, he took our team into the Man United half for the huddle because our supporters were down that end. He’s not scared of anything, mate. He’s a winner. I love winners."
"Respect him tremendously, they fear him, you know, you don’t want to (get on his bad side)."
Interim boss Igor Tudor's dugout debut comes in the north London derby against Arsenal on Sunday, where he will hope Romero can bring his aggression to a Gunners side who dropped points against Wolves on Wednesday night.
Romero will also be crucial for Argentina's upcoming 2026 World Cup campaign where he remains integral to the side under manager Lionel Scaloni.