Despite having up to 10 players sidelined, Leeds went on to claim a 3-2 victory at London Stadium.
Asked how brave a performance was that from his side, Bielsa replied: "I think the word you used is one of the ones that best defined the team today.
"I think it was a triumph for the players, where each of them did things that indicated a very big desire to win.
He added: "I observed clearly that this was a game clearly for each of the players, there was a determination and implication in the search for the victory that today was very visible.
"I think the biggest factor that the game today leaves because when a footballer puts so much effort into what they do, the virtues that they possess come out easier; they're more visible."
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