Monaco have been one of the stories of this season's competition but find themselves trailing to a pair of away goals from Juve hitman Gonzalo Higuaín after the first leg.
It will be a long way back for Leonardo Jardim's side given Juventus's obdurate backline has kept six consecutive clean sheets and not conceded since a group stage win over Sevilla in November.
However, if anyone has the means to break down the Turin outfit's stubborn defence it is Monaco. The Ligue 1 leaders have scored 149 goals in all competitions this season including 28 in the Champions League.
Kylian Mbappé has been one of the stars of the season and the teenager has bagged 22 times in all competitions.
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However, the Argentine attacker was suffering from cramp, his coach confirmed: “It was normal in the circumstances and towards the end of the season.
“Monaco are a side with great talent and we have absolutely not yet sealed our qualification. We need to win the second leg,” he added.
Allegri rested Gianluigi Buffon, Giorgio Chiellini, Miralem Pjanić, Claudio Marchisio, Higuaín, Alex Sandro, Andrea Barzagli and Dani Alves at the weekend – all of whom are expected to return for the second leg.