Ruben Amorim has said it would be "naive" to think he will be allowed to continue as Manchester United manager if the team's poor results continue.
Amorim's job is under intense scrutiny ahead of Sunderland 's visit to Old Trafford on Saturday.
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The Portuguese coach has won just nine of his 33 Premier League matches since his appointment 10 months ago.
And he accepts that it will be "impossible" for co-owner Sir Jim Ratcliffe to continue to show faith if United's form doesn't turn around soon.
"Nobody here is naive," Amorim told a news conference on Friday. "We understand that we need results to