Wout Weghorst looked confused after hearing Manchester United fans' chant for Lisandro Martinez following Wednesday's 3-0 win over Nottingham Forest in the Carabao Cup.
United took a massive step towards Wembley with a dominant display in the first leg of their semi-final at the City Ground.
Marcus Rashford opened the scoring inside six minutes before Weghorst doubled the away side's lead with his first goal for the club. Bruno Fernandes added a third late on to move out of sight ahead of next week's return leg at Old Trafford.
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The Red Devils haven't won a trophy since 2017, something manager Erik ten Hag is keen to change during his first season in charge.
At full-time, United players approached the away end to celebrate with supporters. They serenaded centre-back Martinez, who is already becoming a cult hero, with a chant of 'Argentina!'.
Martinez has played in United's last two games wearing protective headgear after being elbowed in the face by Crystal Palace Jean-Philippe Mateta earlier this month.
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He scored his first goal for the club in Sunday's 3-2 defeat to Arsenal and continues to go from strength to strength. The 25-year-old could be United's best defender.
Weghorst was completely bewildered by the chant, though. He looked towards supporters as they were singing, focusing for a few seconds before walking off the pitch.
The clip has gone viral on social media, with Twitter users pointing out Weghorst's reaction.
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One person said: "Wout Weghorst was confused when Manchester United fans sang that."
Another put: "I see Weghorst peeping in the background."
While a third tweeted: "They have one hell of a fanbase."
Weghorst admitted at full-time he and his teammates weren't pleased with their disappointment, despite scoring three goals.
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He said: "We started well and had a great goal. We didn’t have the control like we wanted it and made it too much up and down after.
"We were lucky their goal was disallowed then to make it 2-0 before half-time was important. I just turned to the goal hoping for a rebound and it came exactly like this. It was nice.
"We were not happy with the way we had played in the first half, we wanted more control. That’s something we did in the second half and with the 3-0 at the end it made it even better.
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"It’s a great result for us tonight, let’s finish it next week."
Topics: Wout Weghorst, Lisandro Martinez, Manchester United, Carabao Cup, Nottingham Forest
Daniel Marland