Around two dozen fans accumulated external Carrington to challenge the Glazer family, who own the club.
One more dissent is normal at Old Trafford on Saturday before United's Premier League match against Norwich.
Ralf Rangnick said fans reserve a "option to offer their viewpoint", and comprehended their "mistake" with the club's seventh-place position.
Joined have won just three of their beyond 12 matches in all rivalries - losing 1-0 at Everton last Saturday - and are ensured to miss the mark concerning last season's last count of 74 places.
"We realize that football is a round of energy and feeling," interval director Rangnick said. "I figure we can all comprehend our allies are frustrated both with where we stand in the table and with the presentation which we displayed against Everton.
"In any case, I accept our allies are one of in the event that not the best in England and as long as they fight in a quiet manner and as along as they actually support the group in the arena I think they reserve the privilege to offer their viewpoint. I can comprehend they have been frustrated."
BBC Sport football columnist Simon Stone announced that fans blended with signature trackers as they intentionally dialed back traffic attempting to enter the preparation complex.
The club shut its generally expected admittance doors trying to keep away from a rehash of the scenes a year prior when allies got to the principle structures and at last had a gathering with then-chief Ole Gunnar Solskjaer.
Writers showing up for interval director Rangnick's public interview were redirected to an alternate access course.
"There was a little and serene dissent outside the Carrington preparing ground today," said a club representative.
"We regard the assessments of fans and stay focused on reinforcing our commitment with them."United and England left-back Luke Shaw could miss the last a long time of the time subsequent to having a medical procedure to eliminate the metal pins put in following his twofold leg break in 2015.
Shaw missed last end of the week's loss by Everton, seven days subsequent to being constrained off at half-time during United's draw with Leicester.
Rangnick said he anticipated that the 26 year old should be out for "basically another four or five weeks".
"It will be challenging for him to be accessible for the remarkable games," he said.
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