Manolas, who along with captain Daniele De Rossi scored the two own goals at the Camp Nou that looked to have sent Roma out, was mobbed by his delirious teammates after glancing home a brilliant headed winner with eight minutes left that sent the Roma supporters into raptures and left a dazed and confused Barca wondering what had hit them.
“All that counts is that we got to the semi-finals against the best team on the planet,” Manolas said after a historic night for the Serie A club, who have made it through to the last four of Europe’s top competition for the first time in three decades.
“We all believed, we didn’t think about the first leg and unfortunate episodes.”
It was last week’s other own goal villain De Rossi who got the home fans believing in the impossible when he converted the penalty that made it 2-0 13 minutes after the break.
The local hero was also the architect of the brilliant Edin Dzeko’s sixth-minute opener, floating a pinpoint pass that the Bosnian took down expertly and poked past Barcelona keeper Marc-Andre ter Stegen.
“Just imagine what this triumph means for us,” said De Rossi. “It’s about as much as I could have hoped for tonight.”
Just as they were at the Camp Nou, Roma were aggressive from the off, and Dzeko gave the home side a deserved lead after just six minutes, brilliantly bringing down De Rossi’s clipped through ball and holding off Samuel Umtiti to score.
Roma doubled their tally in the 58th minute when Dzeko was chopped down by Gerard Pique and De Rossi slotted home the spot-kick.
Eusebio Di Francesco’s side smelled blood, and with the raucous crowd urging their team they tore into wobbling Barca.
De Rossi flashed a header wide in the 69th minute, and 10 minutes later it looked like Ter Stegen had saved the away side’s skin with an incredible close-range stop from Stephan El Shaarawy.
However with just seven minutes left Manolas met another fizzing Aleksandar Kolarov corner with an unsaveable header, sparking wild celebrations on and off the pitch.
Barca finally came out of their shells as Roma tried to hold on to the result, but the hosts held on brilliantly to see the result out and go through to the semis for the first time since 1984, when they lost the final at home to Liverpool, Tuesday’s other victors.
“I am responsible. I make the team, I prepare it. That is the case if we win or lose. I put out the same team as last week,” said Barca coach Ernesto Valverde.
“It is a painful defeat. We wanted to keep going. Now we must lick our wounds. There are other competitions and we must try to win them because we have won nothing yet.”