The France midfielder replaced Francis Coquelin in the 82nd minute as Arsene Wenger sought to add fresh legs to his midfield following Lionel Messi’s 71st-minute opener at the Emirates Stadium.
However, Flamini failed to collect a poor pass from team-mate Per Mertesacker and brought down Messi in the penalty area to give the visitors a chance to secure a 2-0 aggregate lead.
The Barcelona forward duly dispatched his penalty to put the Champions League holders in control of the tie ahead of the second leg at Camp Nou on 16 March.
Unsurprisingly, Twitter had plenty to say on Flamini’s cameo performance against the La Liga champions and social media didn’t hold back in their scathing assessment of the 31-year-old’s contribution.
Deary me Flamini 🙈🙈
— Jody Morris (@morriskid) February 23, 2016
What a contribution there Flamini bloody hell
— EMMANUEL FRIMPONG (@IAMFRIMPONG26) February 23, 2016
— Ian Taylor (@IanTaylor7) February 23, 2016
— Dan Walker (@mrdanwalker) February 23, 2016
Flamini, a man clever enough to produce a renewable replacement for oil, doesn't know that steaming into Messi in the box is a bad idea.
— Paddy Power (@paddypower) February 23, 2016
And he thinks Flamini can still do it😂 https://t.co/8c28hRciKA
— Don Hutchison (@donhutch4) February 23, 2016
Flamini highlights against Barcelona pic.twitter.com/nITqA1AF23
— Football Jokes (@LaughingFooty) February 23, 2016
— OptaJoe (@OptaJoe) February 23, 2016
MORE: Latest Man Utd news
MORE: Latest Arsenal news
MORE: The latest football news