Kylian Mbappe looks cool as ice, unbelievable calmness for an 18-year-old.

All eyes are on the teenage forward as the game gets under way.

Monaco: Subasic, Fabinho, Glik, Jemerson, Sidibe, Dirar, Bernardo Silva, Bakayoko, Lemar, Falcao, Mbappe-Lottin. Subs: Jorge, Joao Moutinho, De Sanctis, Badiashile, Raggi, Cardona, Toure. 

Juventus: Buffon, Barzagli, Bonucci, Chiellini, Dani Alves, Marchisio, Pjanic, Alex Sandro, Higuain, Dybala, Mandzukic. Subs: Benatia, Cuadrado, Lemina, Asamoah, Neto, Lichtsteiner, Rincon.

Referee: Antonio Miguel Mateu Lahoz (Spain) 

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So what's at stake for these two sides, both in Europe and domestically?

Monaco are on course for a first French league title since 2000, and will match their achievement of reaching the 2004 Champions League final if they are victorious over two legs against Juve.

Juventus themselves are nine points clear at the top of Serie A - which they have won for the past five years - and are hoping for a second final appearance in three years.

The players walk out onto the pitch as the Champions League anthem plays out.

I'll never get tired of hearing that.

William Darling: How about players you'd be surprised have won the CL? Jonathan Greening anyone?   

A good twist on the question!

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Wow! What a performance by Ajax. 

The youthful Dutch side have just swept aside Lyon 4-1 to put themselves in the driving seat to reach the Europa League final.

I won't lie. They looked incredible.

Read the report from that match here.

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William Darling: My favourite ever player, Dennis Bergkamp, a whole cabinet of cups, but no Champions League   

John McEnerny: Ruud Van Nistlerooy one of the greatest 9's in CL history!  

Ian Coverdale: The original Ronaldo is the best player to never win CL. Simple as.

Whoever wins this tie will most likely face Real Madrid in the final after a Cristiano Ronaldo hat-trick gave the Spanish side a 3-0 first-leg lead over Atletico Madrid.

That hat-trick was the 47th of Ronaldo's career. Can you remember his first? Watch it below:

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The Ligue 1 side are the first team in the competition's history to find the net at least three times in four consecutive knockout games.

If Kevin Keegan were French, he'd be a Monaco fan.

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In 10 Champions League matches this season, Juventus have conceded just two goals. Yes, tonight they will face the threats of Kylian Mbappe and Radamel Falcao but it's safe to say between the likes of Gianluigi Buffon, Giorgio Chiellini and Leonardo Bonucci, the Old Lady have plenty of defensive experience.

"But I think over the two matches, 180 minutes, experience will play into our hands," Buffon said this week.

Speaking of Zlatan, his Manchester United side are in Europa League action tomorrow as they take on Celta Vigo in their semi-final first leg.

Some breaking news out of Old Trafford and that is defender Luke Shaw is out for the rest of the season with a foot injury. Read more on that here.

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James Dean: Surely Zlatan has got to be up there with the biggest not to have won it if not the biggest   

Simon Woodward: John 'The Beast' Parkin was a pretty big player! And he never won CL medal   

I feel we are deviating somewhat from the line I was pursuing, Simon.

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There's some European football going on right now with Ajax seemingly powering their way into the Europa League final. 

The Dutch side have put four goals past Lyon and there's 15 minutes still to go in that game, although Lyon have got a potentially crucial away goal.

Fascinating fact - Francesco Totti is the only player still playing football at a professional level that featured in Fifa 96.

The only other player who featured in that game and is still playing today is Jamie Cureton. The 41-year-old now turns out for Farnborough.

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On the subject of football's elder statesmen, a day I never thought would arrive has actually arrived, with Francesco Totti announcing today that he will retire at the end of the season.

The 40-year-old Roma forward and club captain has scored 307 goals in 783 appearances since making his debut 24 years ago. 

The very definition of a one-club man, Totti will become a director at Roma once he hangs up his boots.

What a player.

And to think Paulo Dybala was taught everything he knows by Kyle Lafferty.

Maybe that's a bit of an overstatement, but Northern Ireland striker Lafferty did once outscore Dybala when the two played alongside each other at Palermo.

The two were striker partners for the Italian side during the 2013-14 season, with Lafferty scoring 12 goals to Dybala's five.

"He is from the same country as Messi and in time Paulo will take over from both him and Ronaldo," Lafferty said in the Daily Mail., external "Not only has he all the football ability, he also has a strong mentality. He is already being likened to Messi but he will want to be his own man."

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The way I've been talking so far you would think Juventus don't have a player under the age of 30.

The Italian side does, of course, have its own exciting youngster - Paulo Dybala. 

The 23-year-old - dubbed by some as the next Messi - has scored 13 goals this season, including four in the Champions League. 

His skill on the ball prompted Dybala's former Juventus team-mate Paul Pogba to give him an unusual nickname.

“I call Dybala ‘Square R2’,” said Pogba., external “That’s the combination you press on PlayStation to do a turn and shot. He always scores like that.”

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Nikul11: Adebayo Akinfenwa is a pretty big player who's never won the CL.