Tottenham Hotspur defender Van de Ven has admitted he "was completely surprised by" the club's move to dismiss ex-boss Postecoglou.
The Australian's spell in charge came to an end a mere 16 days after he guided Tottenham to a win in the European final, securing the team's first piece of silverware in nearly two decades.
However, this European success was not matched in the Premier League, with the team ending up in a lowly 17th position in his last season in charge.
He was succeeded by former Brentford boss Thomas Frank during the off-season, but Spurs are presently in 11th place, with 22 points from 16 games, following a 3-0 loss to Forest at the weekend.
"He is a really good manager. I still really like him," the Dutch defender stated on The Overlap podcast.
"I'm not sure how everything went behind the scenes. I didn't expect it. It was odd how everything went afterwards - he is the coach that won silverware to Tottenham," he continued.
"Afterwards, when he was dismissed, I texted to my dad and my friends and said, 'I never expected this.'"
The Australian manager arrived at Tottenham from Celtic ahead of the 2023/24 campaign, taking over from Conte. He enjoyed early success with his attacking style of play, collecting an impressive points haul from his opening 10 Premier League games.
Nevertheless, that unbeaten run was halted with four losses in five matches, and the club's form deteriorated, eventually missing out on Champions League qualification by a narrow two points.
In the next campaign, they won just 11 out of 38 league matches.
Although he enjoyed the attacking approach, Netherlands international the defender believes the squad was missing a "alternative strategy" and disclosed he and defensive partner Romero spoke about adopting a more defensive approach with the coach.
"I enjoyed the offensive play under Postecoglou but I like what we have now with Thomas Frank. We are more secure defensively. I don't like getting exposed every game on the counter-attack," he said.
"Initially under Postecoglou, no team was accustomed to playing against our style. We were playing exceptional football."
"However, managers analyse everything and people knew what we were doing. Sometimes we lacked a plan B and we were being caught out. We lacked solutions to resolve it."
"At one point Romero and I approached the manager and suggested we need to adjust tactically and play more defensive to make sure we win those games. He was like, 'I understand with you but I want you two guys to handle this on the pitch, ensure everybody knows.'"
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