Jose Mourinho has lauded the compact defence of Huddersfield, in United’s 2-0 win.
Manchester United dominated proceedings in the first half, but could not break Wagner’s men.
Lukaku opened the scoring in the second half, before Sanchez scored from the rebound of his penalty save.
Even though United ultimately won comfortably, Mourinho paid tribute to Huddersfield’s organisation.
“We always had control of the game, but at half-time it was 0-0,” Mourinho told BBC Sport.
“I guess we had around 85 per cent possession in the first half, but it was not enough.
“We kept doing the same in the second and even at 1-0 we were totally in control. Our defensive line was far from the danger areas.
“We had to be patient, but had to keep the intensity high and the pressure. We had to break down the Berlin Wall organised so well by David Wagner.”