Spurs suffered a painful 4-3 loss at home on Sunday to drop to 11th in the Premier League.
Tottenham have won only one of their last seven matches – a remarkable 4-0 victory at Manchester City – amid a gruelling fixture list and a growing number of absentees.
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Cristian Romero will return to the treatment table ahead of Thursday’s Europa League tie at Rangers where a hostile atmosphere will greet ex-Celtic boss Postecoglou, but the 59-year-old remains determined to succeed in England.
He said: “My role now is to focus on the things I can control and keep preparing the team the best we can to keep progressing as a football team and turn our season around.
“When I look at the performance, I don’t see them lacking confidence or belief. It’s probably the other way. Both penalties we conceded were borne out of desperation.
“I think they are desperate to turn our season around and are really disappointed how it has gone. When you’re in that mood, you kind of lose that composure and discipline you need.
“It’s not like we are hanging on in games. We wouldn’t play like we did if there was a lack of belief and confidence.
“When you get into this situation we are in, there is also a sense of desperation from the players and I thought that cost us.”
Postecoglou was boosted before Chelsea’s visit by Romero and Micky Van De Ven being fit enough to start, but the former lasted only 15 minutes.
Van De Ven also had to be replaced in the 79th minute and Brennan Johnson was another player to be withdrawn.
The prognosis on Van De Ven and Johnson was positive, but Romero – only back from a toe issue – will join Guglielmo Vicario (ankle), Ben Davies (hamstring), Mikey Moore (virus), Wilson Odobert and Richarlison (both hamstring) on the sidelines again.
“Romero is just obviously hugely disappointing. He felt something in his quad,” Postecoglou revealed.
“Brennan just didn’t feel well. He didn’t feel well at half-time but he wanted to give it a go, but he just wasn’t feeling 100 per cent.
“I thought Romero would be OK to play 90 [minutes], but Mickey, probably 60 to 70, so we were always going to take him off. He didn’t feel anything significant, he just felt tightness.
“We just don’t seem to get that sort of ability to just gain some traction. Every time we’ve seemed to, something comes along and disrupts us.
“People keep referring to the City game and we lost Vic straight afterwards for three months, so it seems like we’re just not able to do that, but like you said, they’re uncontrollables.
“My role is to try and maintain the course of the things we can control and keep making sure we’re focused on continuing to grow as a team.”
Despite the Spurs boss claiming his side “played well” during the Chelsea game, his comments seemingly alarmed Sky Sports pundit Carragher.
The former Liverpool defender, who also called for chairman Daniel Levy to leave the club, believes none of his former managers would ever declare their team played well after having conceded four goals.
"Ange said how well they played. I can't imagine any Liverpool manager I played for – and we conceded four in a game – would say in the interview we played well,” he said.
“If you play this way, you'll get the result like at Manchester City, but you'd also get results like this one where you're 2-0 up. I've never got my head around managers saying we play a 'certain way and we will never change' – I think it started with Pep Guardiola at Barcelona.
“This idea that wherever they play, they will play their way. But that was the best team I've ever seen. Pep Guardiola then had to change his Man City team who were winning the leagues every season, putting centre-backs at full-back. This idea that you can't change is alien to me. The game-state dictates how you play, not all the time but if you go away to a tough away ground you shouldn't play the same way as you do against a team at the bottom.”
Carragher also added that Postecoglou could be facing an exit if his side do not develop more than one way of playing.
“There's this idea of playing a pure game and the Tottenham fans singing 'We've got our Tottenham back' but you won't win anything, you won't challenge,” he added.
“I wake up every morning hoping the sun is shining, so I can put some shorts and a T-shirt on but if it's raining, you put your coat on. You can't have this idea about playing one way, it won't work. If it doesn't change, he won't be here next season."