[ad_pod ]When Paris Saint-Germain travel to Old Trafford this evening to take on Manchester United in the Champions League last 16, all eyes will be on two of the world's most precocious youngsters; Kylian Mbappe, and Marcus Rashford.At 20 and 21 years of age respectively, it is interesting to see that both men are arguably their side's key players right now, and are most certainly two players that are bang in form.

Why will they decide the outcome?

Usually, Mbappe would be a threat alongside both Neymar Jr and Edinson Cavani, but the latter duo will miss the game against the Red Devils through injury, leaving the young Frenchman to do it all alone.

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Similarly, Rashford is the man that United fans are currently relying on to score the goals week in, week out, and after being rested against Fulham last time out, the England international should be raring to go.

Both men are guaranteed to have chances at Old Trafford, as Rashford should be able to get in behind a depleted PSG backline which is missing Thomas Meunier and had to play youngster Stanley N'Soki at left back last time out against Bordeaux.

In United's case, their defence consisting of the likes of Ashley Young and Eric Bailly could easily be found wanting by Mbappe's pace; it looks set to be a game decided by whichever youngster packs their shooting boots.

Who looks more likely to threaten the goal?

Both men are unbelievably quick, and whilst Mbappe has always been a goalscorer since breaking onto the scene, Rashford has been given a new lease of life under Ole Gunnar Solskjaer in a central role.

The Red Devils academy graduate has scored six league goals since the Norwegian took over - he was also named as the Premier League Player of the Month for January.

However, PSG's World Cup winning prodigy is a much better player and shows efficiency beyond his years in front of goal; United must make a plan to attempt to stop him, but the Parisians mustn't be complacent around Rashford.