Former Arsenal defender Matthew Upson described it as "so sad" that Gabriel's missed penalty was the decisive one because he has been "so influential" for the Gunners this season.
Upson told BBC Radio 5 Live's Football Daily podcast: "It's really difficult to see because he has just carried so much this season – his attitude, his presence, personality, fight. Gabriel has brought it all and he leaves it out there every time.
"To be brave enough to step up, knowing that penalty-taking is probably not an amazing part of his game, [shows] he's got the mentality and the mettle.
"You can tell he is already refocusing and coming to terms with it, as you have to. He's got a huge tournament to play for his country in the summer, but it's so sad it had to be him. He has been so influential for Arsenal this season.
On the game itself, Upson added: "If you start to break it down on the numbers, percentages, possession, passes and attempts at goal, you would think it was a one-sided boxing match.
"In many aspects it was, but it was designed that way on purpose to achieve a goal, which was to win the Champions League. And it was inches away – it was within touching distance."
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