Having already beaten the Red Devils 3-0 in the league this season, Postecoglou appeared to relish both the tie and what will be his first encounter with the Portuguese manager. "Good draw, it's a home game," he said.
"For all clubs, it's welcome, no matter who you're playing it's going to be tough. He'll (Amorim) have his feet firmly under the desk at United by then, and I look forward to meeting him."
Ange Postecoglou has revealed Son Heung-min is in line to return for his side's Premier League clash with Aston Villa. Tottenham will host Unai Emery's men on the back of a mixed week, tamely beaten by Crystal Palace last weekend before bouncing back in the Carabao Cup on Wednesday.
Despite missing the South Korean striker and losing Micky van de Ven to a hamstring injury, Spurs held on to beat Manchester City 2-1 and make the quarter-finals.
Cristian Romero also limped off and despite scoring his first goal of the season in the clash, Timo Werner has also since emerged as an injury doubt for Villa.
Postecoglou has now opened up on the condition of the trio who played. In his press conference on Friday, he said: "Main one, is Micky, he has sort of strained his hamstring.
"It's not too serious, but probably after the international break for him. As for Romero and Werner, at the moment, still a chance for the weekend."
Van de Ven was seen crying as he left the field, prompting fears he'd suffered a repeat of the injury that kept him out for three months last season. But Postecoglou insisted his reaction was more down to frustration than pain.
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"He was really looking forward to the game, so he was emotional," said the Australian. "At least it's not a bad one like last time that kept him out for quite a while."
Son, meanwhile, has missed the last three games with a thigh injury, but his manager confirmed he would be involved against Villa providing he comes though another team session. "Sonny has trained today, so if he gets through training tomorrow he should be okay," he added.
After beating City, Tottenham were handed a last eight tie at home to Manchester United. By the time that game takes place in December, Ruben Amorim will be in charge of the visitors having officially been confirmed as their new boss earlier today.