Manchester United defender Victor Lindelof is losing the trust of Jose Mourinho, according to former United midfielder Owen Hargreaves.
Soon after, the Terriers scored a quickfire double with Lindelof involved in both goals.
Marcus Rashford pulled a goal back for United in the second half but it was not enough to deter the club's first defeat of the season.
And former United man Hargreaves, who picked up a Premier League title and a Champions League trophy during his four seasons at Old Trafford, believes Lindelof's difficult start to life in Manchester has seen his manager lose faith.
"He's really struggled," Hargreaves told BT Sport. "Obviously at Benfica he played incredibly well in the Champions League, some great performances.
"But we saw him struggle against Real Madrid in the UEFA Super Cup and today he was involved in both goals.
"He was thrust into action when Phil Jones went off injured and he's come on and really, really struggled.
"For Mourinho you have to earn his trust and I think today he's lost some of that with his performance."
Lindelof has made just two substitue appearances in the Premier League since signing for United from Benfica in a £40 million move in the summer.