Barcelona experienced a double whammy after being defeated by Bayern Munich and sent into the Europa League with Inter Milan's victory against Viktoria Plzen.
Substitute Romelu Lukaku marked his return from injury with a late goal as Inter comfortably secured the win that sent them to the last 16.
Edin Dzeko scored twice after Henrikh Mkhitaryan's opener, changing the scoreboard to 4-0, which means Barcelona are guaranteed to finish in third place and compete in Europe's second-tier competition (Europa League) for the second successive season.
Later, Barcelona lost to Bayern, making their situation even worse.
Barcelona thought they had been given a lifeline before half-time but referee Anthony Taylor overturned his initial penalty decision after being sent to review Matthijs de Ligt's challenge on former Bayern striker Robert Lewandowski on the pitchside monitor.
Bayern's Serge Gnabry registered three assists on the night as substitute Benjamin Pavard added to Barcelona's misery in the fifth minute of stoppage time.
Although many home supporters began leaving long before the final whistle, a group of fans did stay behind and applauded as their players returned to the field at the end of a dismal night for the club.
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