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Thiago Motta and Barcelona have history. Besides being a former player for the Blaugrana, Motta has had some memorable encounters with them since leaving the Nou Camp in 2007.
Back in 2010, it was the unfortunate Brazilian-Italian that saw red against Barca in the Champions League semifinal after one of Sergio Busquets' finer moments (YouTube).
Inter Milan, of course, went on to win the Champions League on that occasion, in spite of Motta's perceived injustice. He will, though, be determined to get his own personal revenge.
Of course, he has faced many of the Barcelona side since that occasion. Motta was a member of the Italy squad at Euro 2012 that fell short in the final against their Iberian opponents. He, more than most, will be aware of the challenge ahead.
PSG have weapons to hurt Barcelona. The pace of Lucas Moura and Ezequiel Lavezzi, either side of the mercurial Zlatan Ibrahimovic, can get behind the Catalans frequently fallible defensive line.
They will need, though, for Motta and his defensive midfield partner Blaise Matuidi to be in top form over the 180 minutes if they are to achieve success. Keep Barça playing in front of the back four and they have a chance.
It will be an intriguing tactical battle and one that PSG will surely relish. The pressure is off for them in Europe and they are now, potentially, the most dangerous side remaining in the draw for that very reason.