Postecoglou was first asked on team news ahead of Sunday's game against Everton, which is a game where a win is imperative for the club.
"There's a couple still sore from midweek. Just waiting to see how Brennan Johnson is, he has a bit of a calf complaint. Coming back, Ben Davies should be involved."
The Spurs head coach was then questioned on if the lack of intensity was physical or mental in the North London derby in which they lost 2-1 to Arsenal.
"Bit of both. First half we were way too passive in our approach - with and without the ball.
"We allowed Arsenal to dictate the game, set the tempo, we weren't really able to make an impact like we wanted.
"Second half was better but ultimately it cost us."
The Australian also opened up on the transfer market if the club are trying to bring in players to help ease their injury crisis.
"I know the club is working hard as they can. January is not easy. I know work is being done behind the scenes to get some players in."
He spoke on forward Kolo Muani who joined Juventus despite being linked with Spurs for some time.
"Depends. We were interested in and looking at a number of players. Did we get to point he was coming to us? No."
Spurs' head coach admitted the January window has been difficult so far but he expects some action over the next few weeks.
"It is tricky, as all clubs are finding. Traditionally it ramps up in the final week. We are approaching that for all clubs.
"It is trickier in January because you trying to acquire players from clubs who might want to replace that player, so a lot of logistics involved."