The Brazil centre-back netted the 86th-minute equaliser that sent the match to extra time, before Thiago Silva cancelled out Eden Hazard's 96th-minute penalty to take the score to 3-3 on aggregate and send PSG - who saw Zlatan Ibrahimovic sent off controversially in the first half - through on away goals.
Luiz, who played for Chelsea from 2011 until 2014, did not hold back in celebrating the crucial header, but was quick to explain his reasons after full-time.
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