Manchester United boss Jose Mourinho talked up his opponents pre-match but probably wan't expecting to go in at half-time two goals behind.
Burnley opened the scoring after just two minutes, but it was the second that set tongues wagging as Belgian Defour found the top corner from 30 yards.
It was a wonderful strike, with the ball nestling in the one place that David De Gea in the home goal couln't get to.
Check out the strike for yourself below:
Steven Defour Goal HD - Manchester United0-2Burnley 26.12.2017 https://t.co/6nro1BCkwR #MUN #BUR
— soccer today (@fotball2022) 26 December 2017
Man. Utd 0-2 Burnley (36'). ¡Qué golazo de falta de Steven Defour en Old Trafford! La ha puesto en la escuadra, dónde no ha llegado De Gea. #Premier pic.twitter.com/83FipgAZ5a
— Jaime Ojeda (@Jaime96Ojeda) 26 December 2017