The 26-year-old was dropped from the starting lineup for Monday's London derby with Chelsea, where Brennan Johnson was given the nod on the left-hand side in a 4-1 defeat.
As Tottenham went down to nine men with Cristian Romero and Destiny Udogie's dismissals, Postecoglou made a raft of defensive substitutions, leaving Richarlison on the bench throughout the 90 minutes.
The former Everton man has endured a challenging time both of and off the field recently, and he revealed in September that he was seeking psychological help after breaking down in tears while playing for Brazil.
Richarlison also has just one goal to show from 10 Premier League games this season, in addition to three assists, but he is now facing a spell on the sidelines ahead of his pubis operation.
«The last few months haven't been easy for me. I've had health problems. I've already spoken to the doctors and soon I would do surgery on my pubis,» Richarlison told ESPN Brasil, as quoted by the Evening Standard.
«I've been suffering, fighting for my national team and my club for eight months and haven't been taking care of myself. I think it's time to rest, to stop for a second. I'll think about it in the next few days and soon I will do what is best for me.»
The attacker was also snubbed by Brazil boss Fernando Diniz as he missed out on a call-up for November's fixtures with Colombia and Argentina, although he believes that a break will do him the world of good.
«I was sad when I was not called up but I understand Deniz,» Richarlison added. «In his place, I wouldn't call me up either — I haven't
Read on sportsmole.co.uk