Ronald Koeman believes Matthijs de Ligt is being played out of position at Juventus as he backed the defender after a tough debut, report agencies.
De Ligt, 20, was criticised for his performance in Juve's thrilling 4-3 Serie A victory over Napoli at Allianz Stadium on Saturday.
The Netherlands international, signed for €75million from Ajax in July, came in to play alongside Leonardo Bonucci due to Giorgio Chiellini's knee injury.
Netherlands head coach Koeman said the centre-back's display was below his best. "It was a question why he didn't play the first match. Then he played because somebody else had an injury," he told a news conference on Monday.
"He didn't play well. He had a bad moment with the goal of [Hirving] Lozano. The other two goals were different. It was a free-kick that turned in and that's always hard to defend.
"But yes, he didn't play the way we want to see. I spoke to Matthijs today after lunch."
Koeman suggested De Ligt was struggling to adapt after his move from Ajax and also said he may be getting used in the wrong position.
"Sometime people take change too easily. I still have the newspapers of my first match at Barcelona. It was a disaster. We lost 2-0 and everybody was questioning my arrival," he said.