David de Gea appealed for "more consistency" from referees after Manchester United had Casemiro sent off in their 0-0 draw with Southampton.
United failed to get back to winning ways in the Premier League following their 7-0 thrashing by Liverpool last week.
They spent much of a home game with the division's bottom club on the back foot, especially after Casemiro became the first United player to receive two red cards in the same league season since Nemanja Vidic in 2013-14.
Casemiro was initially booked by Anthony Taylor for his challenge on Carlos Alcaraz, but the referee was instructed by VAR to consult the pitch-side monitor.
Having looked at replays that showed Casemiro going over the top of the ball and sending his studs high into Alcaraz's leg, Taylor changed his decision and showed the Brazil midfielder a red.
United claimed a point despite Southampton attempting 17 shots, with De Gea called into action to preserve their clean sheet on several occasions.
Speaking to Sky Sports, De Gea said: "It should be a game to win today, but the game changed when we lost a man in the team.
"We tried our best to score, but it was difficult. They had some chances, but in the end we showed good team spirit. We have to take the point and keep going.
"I think Casemiro was unlucky. He tried to touch the ball and his foot came up high. I think the referees need to show more consistency. Sometimes they show a red card, and sometimes they don't."
Casemiro is now set to miss the next four domestic games for United. He will be unavailable for the FA Cup quarter-final with Fulham as well as Premier League clashes with Newcastle United, Brentford and Everton.
"It's going to be tough, he's a big player," De Gea said. "We will miss him for four games, but we have a big squad. We have players coming from the bench who do well. We will keep working hard."
Leeds United close Elland Road after security threat
Leeds United closed their Elland Road stadium "until further notice" on Friday following a security threat.
A threat was made on Thursday, reportedly on social media, leading to action being taken by the Premier League club.
A statement from Leeds read: "Leeds United's offices, ticket office, Foundation offices and club shop at Elland Road will be closed until further notice on the advice of the police.
"We apologise for any inconvenience and we will inform the public when normal service resumes."
A West Yorkshire Police statement added: "Police were called to attend at Elland Road football stadium following reports of a security threat to the premises.
"Investigations are currently ongoing to establish the credibility of that threat. The report was received at 9.49pm last night."
'Clubs are starting to call' – Argentina and Brighton star Mac Allister in demand
Argentina midfielder Alexis Mac Allister is drawing enquiries from a number of clubs that could bid for the World Cup winner, his father has revealed.
The 24-year-old has become a key player for Premier League side Brighton and Hove Albion, and he has been recently linked with the likes of Manchester City and Liverpool.
Playing a prominent role in Argentina's Qatar 2022 triumph has raised Mac Allister's profile, and his market value.
Brighton would be reluctant to see him leave, but Carlos Mac Allister, who was also capped by Argentina, says his son is wanted elsewhere.
"The clubs are starting to call us about Alexis, but there are no concrete conversations for now," he said, quoted by TNT Sports.
"We will decide together with Brighton, they deserve respect. We will also choose the best project based on the coach, it is not just about money."
Alexis Mac Allister, who has a contract through to the end of the 2024-25 season, recently said his "next step" should be with another Premier League club.
Liverpool may be looking to refresh their midfield at the end of the campaign, while Mac Allister could also be a shrewd replacement for Ilkay Gundogan should the Germany international leave City.
Brighton sit seventh in the Premier League and are firmly in the hunt for a European place, with Mac Allister netting seven goals and adding one assist during their success so far this term in that competition.
They are also through to the FA Cup semi-finals, where Manchester United await them at Wembley.
If Mac Allister stays in England, he would want to play for an elite team.
Mac Allister told TyC Sports, as reported on March 1: "I don't have a particular team where I say 'this is the way I play'. I think that here in the Premier League, there are very strong teams that play very well, like Manchester City and Arsenal.
"Chelsea too, I had [Graham] Potter as coach [at Brighton] and I know the idea he has of playing football.
"Manchester United are returning to be what they were, and Liverpool are going through some ups and downs but they still have a very important team.
"If I have to say a place, I would like my next step to be in the Premier League. But the truth is that I am very focused here in Brighton and enjoying the present."
Australia 3-1 Ecuador: Irvine, Mabil and Kuol lead Socceroos to victory
Jackson Irvine, Awer Mabil and Garang Kuol fired Australia to a 3-1 victory against Ecuador at the CommBank Stadium on Friday.
In their first game since the World Cup in Qatar, Australia's preparations for the Asian Cup got off to an ideal start.
First-half goals from Jackson and Mabil came either side of Felix Torres' equaliser in an action-packed opening period.
A much quieter second half saw few opportunities before 18-year-old Kuol scored his first senior international goal, ensuring there would be no late fightback from the South American side.
The hosts took the lead after 13 minutes, Mitchell Duke brilliantly volleying Craig Goodwin's free-kick back across the face of goal to Irvine, who converted into the empty net – though replays showed Duke should have been flagged for offside.
Ecuador responded quickly to the setback and, having seen Michael Estrada drag a glorious chance wide of the mark, levelled when Torres met Jeremy Sarmiento's cross and guided a header past Mathew Ryan.
Australia regained the lead in the 32nd minute, with Irvine dispossessing Piero Hincapie on the edge of the area and seeing the ball fall kindly for Mabil, who smashed a fierce strike into the top-right corner.
Manchester City's Alex Robertson made his debut in the second half, despite having yet to make a senior appearance for the Premier League side, following in the footsteps of his father and grandfather in featuring for the Socceroos.
There were few opportunities in the second half, but Moises Ramirez clawed an effort from Kye Rowles off the line, with Goodwin's set-piece delivery again causing problems for the visitors.
Though Ecuador dominated possession for much of the latter exchanges, the South Americans were unable to create opportunities to test Ryan and the hosts held on to secure victory.
The win was secured in the 84th minute, with teenage substitute Kuol on hand to poke in Aziz Behich's driven cross.
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