Ronald Koeman has defended Matthijs de Ligt but says the Netherlands centre-back must alter his game at Juventus.
The former Ajax captain has made a stuttering start to the 2019-20 season for both club and country after joining the Serie A champions over the summer in a €75 million (£68m/$84m) deal.
De Ligt was at fault as Northern Ireland opened the scoring in their Euro 2020 qualifier against Netherlands on Thursday, with Josh Magennis beating him in the air.
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It was the latest in a series of errors the 20-year-old defender has made this term, but Koeman has backed De Ligt to come good.