Manchester United manager Ole Gunnar Solskjaer was unhappy with Southampton's physicality in their 1-1 draw on Sunday.
The Norwegian was furious that Bruno Fernandes was not awarded a free-kick in the build-up to Southampton's 30th minute opener.
Fernandes was crunched by a hard tackle from Jack Stephens and earned a yellow-card for his remonstrations after the incident.
"We should do better, if you don't get a foul, we should make sure we block the shot, put your body on the line and make sure they don't get a strike on target," Solskjaer said.
"That being said, it's a foul, he goes straight through Bruno, with his armpit across him.
"We can't go from one extreme of basketball to rugby now. I like the more lenient way, it's more men's football but still, that's a foul. You could see early on, with the fans, it gets the crowd going flying into tackles and we did suffer a few tackles that was part of their thinking early on if you like."