United were beaten 4-0 by Crystal Palace in the Premier League on Monday, with Garnacho playing the entire match.
While the likes of Michael Olise and Eberi Eze shone, Garnacho, Rasmus Hojlund, and Antony were kept quiet.
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Garnacho's brother, Roberto, took to X and said "What are we good at?"
Many United fans are likely to agree with his statement, given the team's recent displays.
The Red Devils have already lost more times in the Premier League this season than any previous campaign.