And here come the changes...

Pierre-Emerick Aubameyang and Mesut Ozil are among those to go off for Arsenal.

The German is cheered heavily as he walks off. A good day's work for him? And a goal to take home as a souvenir.

It's that man Timothy Weah again. He speeds down the right and whips a dangerous ball into the box but it's well intercepted by Shkodran Mustafi before it reaches Christopher Nkunku.

Timothy Weah has struggled to get into those kinds of positions but when he does, he has been causing Arsenal plenty of problems.

Sead Kolasinac has had a difficult day.

Timothy Weah takes on Sead Kolasinac on the right and the Arsenal full-back can't keep up with his pace.

He slides and takes the trailing foot of Weah, who goes down and is awarded a penalty.

That kid has been the best player on the pitch... again.

Image source, Getty Images

Aaron Ramsey and Mesut Ozil link up well on the edge of the box. Ramsey's attempted flick doesn't quite fall to Ozil as he darts inside the area but Arsenal keep the pressure up and earn a free-kick through Matteo Guendouzi.

Timothy Weah hasn't had the best service today but he's still been a nuisance. He escapes the offside trap down the right and forces a low save from Emiliano Martinez from a tight angle.

The resulting corner is whipped in and is met by a PSG head but Matteo Guendouzi is on hand to hook it out of danger with his right foot.

All PSG at the moment. Adrien Rabiot is the one making things happen and Aaron Ramsey has to deal with him.

The Welshman uses his experience to win a free-kick but PSG soon have the ball back in their own half.

Hafiz Wan‏: Loving the energy Unai Emery has brought into the training. Looks to have been brought onto the pitch too. A lot of positives to look forward to for the coming season.

Christopher Nkunku fires it towards goal from the resulting free-kick and forces a save from Emiliano Martinez.

It's hit with pace but was far too central.

Matteo Guendouzi slides in to recover the ball from Adrien Rabiot outside the area and thinks he's won the ball.

The referee thinks otherwise and penalises him for a foul - much to the frustration of the youngster.

Free-kick in a good position here.

Image source, Getty Images

Arsenal had 58% possession in the first half but PSG are controlling the ball at the moment. Adrien Rabiot tries to get a shot away but it's blocked in the box.

Six teenagers in the PSG side today. That inexperience showed in the first half but they have started brightly again here.

Francis Edwards: Say what you like about the last few seasons, but Arsenal have a real chance. If Aubameyang stays fit they easily have the best striker in league. He gets big goals in big games, that is something that Kane lacks!

Aaron Ramsey and Alexandre Lacazette are on, Mohamed Elneny and Alex Iwobi are off.

And as expected there's a change in keepers but it's Emiliano Martinez who replaces Bernd Leno, not Petr Cech.

So here we go. Second half under way.

KO: Some really good play. Guendouzi is so assured on the ball!! Really excited to watch him develop!!

Against Atletico Madrid, Unai Emery made just one change at half-time - Petr Cech replacing Bernd Leno - but introduced eight players all at once shortly afterwards.

I'd expect to see Reiss Nelson, Emile Smith-Rowe and Alexandre Lacazette among the inevitable changes that will come in this game.