Vicario appeared to question the Spurs fans' reaction at full time on Thursday
Postecoglou has defended the star, insisting he simply cares about the club
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Tottenham goalkeeper Guglielmo Vicario has issued an apology to fans offended by a post-match exchange following the club's 1-0 Europa League defeat to AZ Alkmaar.
Vicario turned and stormed off when his attempts to gee up those in the away end following the defeat in the first leg of the last-16 tie with AZ backfired and instead unleashed a barrage of abuse.
The Tottenham shot-stopped had made several fine saves to keep the tie alive ahead of the second leg, but angered some supporters inside the AFAS Stadium with his gesture.
Vicario has posted a lengthy message to supporters on social media in a bid to 'clarify' his intentions.
The Italian international stated he had attempted to keep everyone 'unified' despite the defeat and sought to reiterate his commitment to the team and fans.
'As a team, we take full responsibility for our terrible performance on the pitch last night. We will work even harder to understand, as a mature group, what went wrong,' Vicario wrote.
'Still, we have a great opportunity, starting from Sunday, to redeem ourselves and prepare in the best way possible for the second battle next Thursday.
'Regarding what happened at the final whistle in front of the away section, I want to clarify my intention to keep everyone as united as possible, even in the disappointment we have caused our people.
'If I have offended anyone, I apologise to those who felt affected.
'Post-match emotions can be misunderstood, but I assure you that my commitment to this team and you, our fans, grows stronger day after day.'
The 28-year-old had already addressed the fans reaction to his gesture post-match, acknowledging their frustration at the performance.
'We need them every game, home and away,' Vicario said post-match.
'We know they are very important for us and now is a big moment of the season and with them we can play with one more man on the pitch so it's so important.'
Defeat in the Netherlands was the 18th of a desperate season for Tottenham. They set out with eyes on the top of the Premier League and with head coach Ange Postecoglou reminding supporters he had never failed to win a trophy in his second season at any club.
But Spurs languish 13th in the league ahead of Sunday's game at home against Bournemouth, and are out of the domestic cup competitions.
Spurs boss Ange Postecoglou defended Vicario's actions post-match, insisting the goalkeeper wants 'everyone on board' as the club seek to salvage their season.
'Vic is very passionate about this football club,' Postecoglou said. 'He's very passionate about what we're trying to do here, and he wants to win, and he wants everyone on board with that.
'And if people think there is one bad or vindictive bone in Vicario's makeup, they don't know the man that I do.
'Whatever he does, he does what he thinks is best for the team and best for this football club because he really cares.'