Manchester United made a double change around the 68th minute in their Premier League match against West Ham, with Harry Maguire and Matheus Cunha replaced by Leny Yoro and Benjamin Sesko.
The substitutions came as Michael Carrick looked to freshen up his side while trailing 1-0 at the London Stadium.
Maguire's exit was expected in a defensive reshuffle, but Cunha's reaction stole the attention.
The Brazilian forward appeared visibly unhappy as he walked off the pitch.
Cameras captured Cunha shaking his head and muttering under his breath before he reached the bench.
Once seated, he was seen complaining animatedly to a teammate, gesturing with frustration.
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