Erik ten Hag said Manchester United will "think about" appealing Casemiro's red card against Crystal Palace.
Casemiro was dismissed in the 70th minute after the Video Assistant Referee advised his tangle with Palace counterpart Will Hughes was violent conduct and warranted a straight red card.
The sending off means Casemiro will miss next week's Premier League double-header against Leeds United, as well as the visit of Leicester City on February 19.
Read more: Ten Hag slams two Crystal Palace players over Man United star Casemiro red card
Ten Hag conceded Casemiro had "crossed a line" and United have a small window to lodge an appeal before the visit of Leeds on Wednesday.
"First of all, we have to deal with it and we will do, but it is not right," Ten Hag said. "It shouldn't have happened. And last week, VAR doesn't do anything about the tackle (on Christian Eriksen by Andy Carroll), but this was avoidable and because in this incident there have to be consequences and they are inconsistent and that is not right, that is not fair against us.
"We have to think about [appealing]. But be fair, we have seen when you're freezing (the frame), Casemiro is crossing the line. But many more players were crossing the line there.
"We get also some warnings about our team reacting like this and I think you have to do it, you have to protect each other but we want to keep our standards and values at Man United, keep them high.
"We can't cross lines but we have to stick together and, yes, we have to stand for each other, yes."
Should Casemiro serve his suspension, Marcel Sabitzer is expected to come in for his full United debut against Leeds.
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