The goalkeeper was handed the armband at the London Stadium by Jürgen Klopp, with Jordan Henderson out due to a thigh injury and James Milner among the substitutes in the capital.
It was an opportunity Mignolet later admitted to having dreamed of since childhood – and even after the fixture had finished in a 4-1 victory for his team, the Belgian could not adequately summarise his emotions.
“[I found out] only an hour before the game when we arrived in the dressing room. I was a bit surprised,” he told Liverpoolfc.com.
“It’s a big honour. I can’t grasp it as of yet. It’s something I was dreaming about when I was a small kid: to be a captain of a Premier League team. To do that as a Liverpool player is unbelievable.
“It was a very proud moment and I’m speechless about it actually!”